docs/home/classes/ContentUtility.class.php

   1 <?php\r
   2 /************************************************************************/\r
   3 /* AContent                                                             */\r
   4 /************************************************************************/\r
   5 /* Copyright (c) 2010                                                   */\r
   6 /* Inclusive Design Institute                                           */\r
   7 /*                                                                      */\r
   8 /* This program is free software. You can redistribute it and/or        */\r
   9 /* modify it under the terms of the GNU General Public License          */\r
  10 /* as published by the Free Software Foundation.                        */\r
  11 /************************************************************************/\r
  12 \r
  13 /**\r
  14 * Content Utility functions \r
  15 * @access       public\r
  16 * @author       Cindy Qi Li\r
  17 */\r
  18 \r
  19 if (!defined('TR_INCLUDE_PATH')) exit;\r
  20 \r
  21 class ContentUtility {\r
  22 \r
  23         /**\r
  24         * This function cuts out html body\r
  25         * @access  public\r
  26         * @param   $text  html text\r
  27         * @author  Cindy Qi Li\r
  28         */\r
  29         public static function getHtmlBody($text) {\r
  30                 /* strip everything before <body> */\r
  31                 $start_pos      = strpos(strtolower($text), '<body');\r
  32                 if ($start_pos !== false) {\r
  33                         $start_pos      += strlen('<body');\r
  34                         $end_pos        = strpos(strtolower($text), '>', $start_pos);\r
  35                         $end_pos        += strlen('>');\r
  36         \r
  37                         $text = substr($text, $end_pos);\r
  38                 }\r
  39         \r
  40                 /* strip everything after </body> */\r
  41                 $end_pos        = strpos(strtolower($text), '</body>');\r
  42                 if ($end_pos !== false) {\r
  43                         $text = trim(substr($text, 0, $end_pos));\r
  44                 }\r
  45         \r
  46                 return $text;\r
  47         }\r
  48 \r
  49         /**\r
  50         * This function cuts out requested tag information from html head\r
  51         * @access  public\r
  52         * @param   $text  html text\r
  53         * @param   $tags  a string or an array of requested tags\r
  54         * @author  Cindy Qi Li\r
  55         */\r
  56         public static function getHtmlHeadByTag($text, $tags)\r
  57         {\r
  58                 $head = ContentUtility::getHtmlHead($text);\r
  59                 $rtn_text = "";\r
  60                 \r
  61                 if (!is_array($tags) && strlen(trim($tags)) > 0)\r
  62                 {\r
  63                         $tags = array(trim($tags));\r
  64                 }\r
  65                 foreach ($tags as $tag)\r
  66                 {\r
  67                         $tag = strtolower($tag);\r
  68         \r
  69                         /* strip everything before <{tag}> */\r
  70                         $start_pos      = stripos($head, '<'.$tag);\r
  71                         $temp_head = $head;\r
  72                         \r
  73                         while ($start_pos !== false) \r
  74                         {\r
  75                                 $temp_text = substr($temp_head, $start_pos);\r
  76                 \r
  77                                 /* strip everything after </{tag}> or />*/\r
  78                                 $end_pos        = stripos($temp_text, '</' . $tag . '>');\r
  79                 \r
  80                                 if ($end_pos !== false) \r
  81                                 {\r
  82                                         $end_pos += strlen('</' . $tag . '>');\r
  83                                         \r
  84                                         // add an empty line after each tag information\r
  85                                         $rtn_text .= trim(substr($temp_text, 0, $end_pos)) . '\r
  86                 \r
  87         ';\r
  88                                 }\r
  89                                 else  // match /> as ending tag if </tag> is not found\r
  90                                 {\r
  91                                         $end_pos        = stripos($temp_text, '/>');\r
  92                                         \r
  93                                         if($end_pos === false && stripos($temp_text, $tag.'>')===false){\r
  94                                                 //if /> is not found, then this is not a valid XHTML\r
  95                                                 //text iff it's not tag>\r
  96                                                 $end_pos = stripos($temp_text, '>');\r
  97                                                 $end_pos += strlen('>');\r
  98                                         } else {\r
  99                                                 $end_pos += strlen('/>');\r
 100                                         }\r
 101                                         // add an empty line after each tag information\r
 102                                         $rtn_text .= trim(substr($temp_text, 0, $end_pos)) . '\r
 103                 \r
 104         ';\r
 105                                 }\r
 106                                 \r
 107                                 // initialize vars for next round of matching\r
 108                                 $temp_head = substr($temp_text, $end_pos);\r
 109                                 $start_pos = stripos($temp_head, '<'.$tag);\r
 110                         }\r
 111                 }\r
 112                 return $rtn_text;\r
 113         }\r
 114 \r
 115         /**\r
 116         * This function cuts out html head\r
 117         * @access  private\r
 118         * @param   $text  html text\r
 119         * @author  Cindy Qi Li\r
 120         */\r
 121         private static function getHtmlHead ($text) {\r
 122                 /* strip everything before <head> */\r
 123                 $start_pos      = stripos($text, '<head');\r
 124                 if ($start_pos !== false) {\r
 125                         $start_pos      += strlen('<head');\r
 126                         $end_pos        = stripos($text, '>', $start_pos);\r
 127                         $end_pos        += strlen('>');\r
 128         \r
 129                         $text = substr($text, $end_pos);\r
 130                 }\r
 131         \r
 132                 /* strip everything after </head> */\r
 133                 $end_pos        = stripos($text, '</head');\r
 134                 if ($end_pos !== false) {\r
 135                         $text = trim(substr($text, 0, $end_pos));\r
 136                 }\r
 137                 return $text;\r
 138         }\r
 139 \r
 140         private static function embedFLV($text) {\r
 141                 global $content_base_href;\r
 142                 \r
 143                 // .flv - uses Flowplayer 3.0 from flowplayer.org (playing file via full URL)\r
 144                 preg_match_all("#\[media[0-9a-z\|]*\]http://([\w\./-]+)\.flv\[/media\]#i",$text,$media_matches[0],PREG_SET_ORDER);\r
 145                 $media_replace[0] ="<a class=\"flowplayerholder\"\r
 146                 style=\"display:block;width:##WIDTH##px;height:##HEIGHT##px;\"\r
 147                 href=\"http://##MEDIA1##.flv\">\r
 148                 </a>";\r
 149                 \r
 150                 // .flv - uses Flowplayer 3.0 from flowplayer.org (playing file from AT_content_dir)\r
 151                 preg_match_all("#\[media[0-9a-z\|]*\]([\w\./-]+)\.flv\[/media\]#i",$text,$media_matches[1],PREG_SET_ORDER);\r
 152                 $media_replace[1] ="<a class=\"flowplayerholder\"\r
 153                 style=\"display:block;width:##WIDTH##px;height:##HEIGHT##px;\"\r
 154                 href=\"".TR_BASE_HREF."get.php/".$content_base_href."##MEDIA1##.flv\">\r
 155                 </a>";\r
 156                 \r
 157                 $has_flv = false;\r
 158                 // Executing the replace\r
 159                 for ($i=0;$i<count($media_replace);$i++){\r
 160                         foreach($media_matches[$i] as $media)\r
 161                         {\r
 162                                 if (is_array($media)) $has_flv = true;\r
 163                                 \r
 164                                 //find width and height for each matched media\r
 165                                 if (preg_match("/\[media\|([0-9]*)\|([0-9]*)\]*/", $media[0], $matches)) \r
 166                                 {\r
 167                                         $width = $matches[1];\r
 168                                         $height = $matches[2];\r
 169                                 }\r
 170                                 else\r
 171                                 {\r
 172                                         $width = 425;\r
 173                                         $height = 350;\r
 174                                 }\r
 175                                 \r
 176                                 //replace media tags with embedded media for each media tag\r
 177                                 $media_input = $media_replace[$i];\r
 178                                 $media_input = str_replace("##WIDTH##","$width",$media_input);\r
 179                                 $media_input = str_replace("##HEIGHT##","$height",$media_input);\r
 180                                 $media_input = str_replace("##MEDIA1##","$media[1]",$media_input);\r
 181                                 $media_input = str_replace("##MEDIA2##","$media[2]",$media_input);\r
 182                                 $text = str_replace($media[0],$media_input,$text);\r
 183                         }\r
 184                 }\r
 185                 \r
 186                 if ($has_flv)\r
 187                 {\r
 188                         $text .= '\r
 189                         <script language="JavaScript">\r
 190                                 $f("a.flowplayerholder", "'.TR_BASE_HREF.'include/jscripts/flowplayer/flowplayer-3.2.5.swf", { \r
 191                                         clip: { autoPlay: false },              \r
 192                                 plugins:  { \r
 193                                         controls: { \r
 194                                             all: false,  \r
 195                                             play: true,  \r
 196                                             scrubber: true \r
 197                                         }         \r
 198                                     }\r
 199                                 });\r
 200                         </script>\r
 201                         ';\r
 202                 }\r
 203                 \r
 204                 return $text;           \r
 205         }\r
 206         \r
 207         public static function embedMedia($text) {\r
 208                 if (preg_match("/\[media(\|[0-9]+\|[0-9]+)?\]*/", $text)==0){\r
 209                         return $text;\r
 210                 }\r
 211         \r
 212                 // remove the spaces in [media] tag, otherwise, the next line converts URL inside [media] into <a> tag\r
 213                 $text = preg_replace("/(\[media\])([\s]*)(.*)(\[\/media\])/", '$1$3$4', $text);\r
 214                 $text = preg_replace("/(\[media\])(.*)([\s]*)(\[\/media\])/U", '$1$2$4', $text);\r
 215                 \r
 216                 $media_matches = Array();\r
 217                 \r
 218                 /*\r
 219                         First, we search though the text for all different kinds of media defined by media tags and store the results in $media_matches.\r
 220                         \r
 221                         Then the different replacements for the different media tags are stored in $media_replace.\r
 222                         \r
 223                         Lastly, we loop through all $media_matches / $media_replaces. (We choose $media_replace as index because $media_matches is multi-dimensioned.) It is important that for each $media_matches there is a $media_replace with the same index. For each media match we check the width/height, or we use the default value of 425x350. We then replace the height/width/media1/media2 parameter placeholders in $media_replace with the correct ones, before running a str_replace on $text, replacing the given media with its correct replacement.\r
 224                         \r
 225                 */\r
 226                 \r
 227                 // youtube videos\r
 228                 preg_match_all("#\[media[0-9a-z\|]*\]http://([a-z0-9\.]*)?youtube.com/watch\?v=([a-z0-9_-]+)\[/media\]#i",$text,$media_matches[1],PREG_SET_ORDER);\r
 229                 $media_replace[1] = '<object width="##WIDTH##" height="##HEIGHT##"><param name="movie" value="http://##MEDIA1##youtube.com/v/##MEDIA2##"></param><embed src="http://##MEDIA1##youtube.com/v/##MEDIA2##" type="application/x-shockwave-flash" width="##WIDTH##" height="##HEIGHT##"></embed></object>';\r
 230                         \r
 231                 // .mpg\r
 232                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).mpg\[/media\]#i",$text,$media_matches[2],PREG_SET_ORDER);\r
 233                 $media_replace[2] = "<object data=\"##MEDIA1##.mpg\" type=\"video/mpeg\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mpg\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.mpg\">##MEDIA1##.mpg</a></object>";\r
 234                 \r
 235                 // .avi\r
 236                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).avi\[/media\]#i",$text,$media_matches[3],PREG_SET_ORDER);\r
 237                 $media_replace[3] = "<object data=\"##MEDIA1##.avi\" type=\"video/x-msvideo\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.avi\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.avi\">##MEDIA1##.avi</a></object>";\r
 238                 \r
 239                 // .wmv\r
 240                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).wmv\[/media\]#i",$text,$media_matches[4],PREG_SET_ORDER);\r
 241                 $media_replace[4] = "<object data=\"##MEDIA1##.wmv\" type=\"video/x-ms-wmv\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.wmv\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.wmv\">##MEDIA1##.wmv</a></object>";\r
 242                 \r
 243                 // .mov\r
 244                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).mov\[/media\]#i",$text,$media_matches[5],PREG_SET_ORDER);\r
 245                 $media_replace[5] = "<object classid=\"clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B\" codebase=\"http://www.apple.com/qtactivex/qtplugin.cab\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mov\"><param name=\"controller\" value=\"true\"><param name=\"autoplay\" value=\"false\"><!--[if gte IE 7]> <!--><object type=\"video/quicktime\" data=\"##MEDIA1##.mov\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"controller\" value=\"true\"><param name=\"autoplay\" value=\"false\"><a href=\"##MEDIA1##.mov\">##MEDIA1##.mov</a></object><!--<![endif]--><!--[if lt IE 7]><a href=\"##MEDIA1##.mov\">##MEDIA1##.mov</a><![endif]--></object>";\r
 246                 \r
 247                 // .swf\r
 248                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).swf\[/media\]#i",$text,$media_matches[6],PREG_SET_ORDER);\r
 249                 $media_replace[6] = "<object type=\"application/x-shockwave-flash\" data=\"##MEDIA1##.swf\" width=\"##WIDTH##\" height=\"##HEIGHT##\">  <param name=\"movie\" value=\"##MEDIA1##.swf\"><param name=\"loop\" value=\"false\"><a href=\"##MEDIA1##.swf\">##MEDIA1##.swf</a></object>";\r
 250                 \r
 251                 // .mp3\r
 252                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).mp3\[/media\]#i",$text,$media_matches[7],PREG_SET_ORDER);\r
 253                 $media_replace[7] = "<object type=\"audio/mpeg\" data=\"##MEDIA1##.mp3\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mp3\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.mp3\">##MEDIA1##.mp3</a></object>";\r
 254                 \r
 255                 // .wav\r
 256                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).wav\[/media\]#i",$text,$media_matches[8],PREG_SET_ORDER);\r
 257                 $media_replace[8] ="<object type=\"audio/x-wav\" data=\"##MEDIA1##.wav\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.wav\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.wav\">##MEDIA1##.wav</a></object>";\r
 258                 \r
 259                 // .ogg\r
 260                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).ogg\[/media\]#i",$text,$media_matches[9],PREG_SET_ORDER);\r
 261                 $media_replace[9] ="<object type=\"application/ogg\" data=\"##MEDIA1##.ogg\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.ogg\"><a href=\"##MEDIA1##.ogg\">##MEDIA1##.ogg</a></object>";\r
 262                 \r
 263                 // .mid\r
 264                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).mid\[/media\]#i",$text,$media_matches[10],PREG_SET_ORDER);\r
 265                 $media_replace[10] ="<object type=\"application/x-midi\" data=\"##MEDIA1##.mid\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mid\"><a href=\"##MEDIA1##.mid\">##MEDIA1##.mid</a></object>";\r
 266                 \r
 267                 $text = preg_replace("#\[media[0-9a-z\|]*\](.+[^\s\"]+).mid\[/media\]#i", "<object type=\"application/x-midi\" data=\"\\1.mid\" width=\"".$width."\" height=\"".$height."\"><param name=\"src\" value=\"\\1.mid\"><a href=\"\\1.mid\">\\1.mid</a></object>", $text);\r
 268         \r
 269                 // Executing the replace\r
 270                 for ($i=1;$i<=count($media_replace);$i++){\r
 271                         foreach($media_matches[$i] as $media)\r
 272                         {\r
 273                                 \r
 274                                 //find width and height for each matched media\r
 275                                 if (preg_match("/\[media\|([0-9]*)\|([0-9]*)\]*/", $media[0], $matches)) \r
 276                                 {\r
 277                                         $width = $matches[1];\r
 278                                         $height = $matches[2];\r
 279                                 }\r
 280                                 else\r
 281                                 {\r
 282                                         $width = 425;\r
 283                                         $height = 350;\r
 284                                 }\r
 285                                 \r
 286                                 //replace media tags with embedded media for each media tag\r
 287                                 $media_input = $media_replace[$i];\r
 288                                 $media_input = str_replace("##WIDTH##","$width",$media_input);\r
 289                                 $media_input = str_replace("##HEIGHT##","$height",$media_input);\r
 290                                 $media_input = str_replace("##MEDIA1##","$media[1]",$media_input);\r
 291                                 $media_input = str_replace("##MEDIA2##","$media[2]",$media_input);\r
 292                                 $text = str_replace($media[0],$media_input,$text);\r
 293                         }\r
 294                 }\r
 295                 \r
 296                 return $text;\r
 297         }\r
 298 \r
 299         public static function makeClickable($text) {\r
 300                 $text = ContentUtility::embedMedia($text);\r
 301         \r
 302                 // convert plain text URL to clickable URL.\r
 303                 // Limited conversion: It doesn't cover the case when the stuff in front of the URL is not a word. For example:\r
 304                 // <p>http://google.ca</p>\r
 305                 // "http://google.ca" \r
 306                 $text = preg_replace('/(^|[\n ])([\w]*?)((?<!(\[media\]))http(s)?:\/\/[\w]+[^ \,\"\n\r\t\)<]*)/is', \r
 307                                      '$1$2<a href="$3">$3</a>', $text);\r
 308                 \r
 309                 // convert email address to clickable URL that pops up "send email" interface with the address filled in\r
 310                 $text = preg_replace('/(?|<a href="mailto[\s]*:[\s]*([_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'\@'\r
 311                                     .'[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'(\.[a-zA-Z]{1,6})+)">(.*)<\/a>'\r
 312                                     .'|((((([_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'\@'\r
 313                                     .'[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'(\.[a-zA-Z]{1,6})+))))))/i',\r
 314                                                         "<a href=\"mailto:\\1\">\\5</a>",\r
 315                                                         $text);\r
 316                 \r
 317                 // flv conversion needs to come after url conversion (2 lines above) otherwise the url to flowplayer swf file\r
 318                 // in the script for a.flowplayerholder is converted\r
 319                 $text = ContentUtility::embedFLV($text);\r
 320                 \r
 321                 return $text;\r
 322         }\r
 323 \r
 324         public static function myCodes($text, $html = false) {\r
 325                 global $_base_path;\r
 326                 global $HTTP_USER_AGENT;\r
 327         \r
 328                 if (substr($HTTP_USER_AGENT,0,11) == 'Mozilla/4.7') {\r
 329                         $text = str_replace('[quote]','</p><p class="block">',$text);\r
 330                         $text = str_replace('[/quote]','</p><p>',$text);\r
 331         \r
 332                         $text = str_replace('[reply]','</p><p class="block">',$text);\r
 333                         $text = str_replace('[/reply]','</p><p>',$text);\r
 334                 } else {\r
 335                         $text = str_replace('[quote]','<blockquote>',$text);\r
 336                         $text = str_replace('[/quote]','</blockquote><p>',$text);\r
 337         \r
 338                         $text = str_replace('[reply]','</p><blockquote class="block"><p>',$text);\r
 339                         $text = str_replace('[/reply]','</p></blockquote><p>',$text);\r
 340                 }\r
 341         \r
 342                 $text = str_replace('[b]','<strong>',$text);\r
 343                 $text = str_replace('[/b]','</strong>',$text);\r
 344         \r
 345                 $text = str_replace('[i]','<em>',$text);\r
 346                 $text = str_replace('[/i]','</em>',$text);\r
 347         \r
 348                 $text = str_replace('[u]','<u>',$text);\r
 349                 $text = str_replace('[/u]','</u>',$text);\r
 350         \r
 351                 $text = str_replace('[center]','<center>',$text);\r
 352                 $text = str_replace('[/center]','</center><p>',$text);\r
 353         \r
 354                 /* colours */\r
 355                 $text = str_replace('[blue]','<span style="color: blue;">',$text);\r
 356                 $text = str_replace('[/blue]','</span>',$text);\r
 357         \r
 358                 $text = str_replace('[orange]','<span style="color: orange;">',$text);\r
 359                 $text = str_replace('[/orange]','</span>',$text);\r
 360         \r
 361                 $text = str_replace('[red]','<span style="color: red;">',$text);\r
 362                 $text = str_replace('[/red]','</span>',$text);\r
 363         \r
 364                 $text = str_replace('[purple]','<span style="color: purple;">',$text);\r
 365                 $text = str_replace('[/purple]','</span>',$text);\r
 366         \r
 367                 $text = str_replace('[green]','<span style="color: green;">',$text);\r
 368                 $text = str_replace('[/green]','</span>',$text);\r
 369         \r
 370                 $text = str_replace('[gray]','<span style="color: gray;">',$text);\r
 371                 $text = str_replace('[/gray]','</span>',$text);\r
 372         \r
 373                 $text = str_replace('[op]','<span class="bigspacer"></span> <a href="',$text);\r
 374                 $text = str_replace('[/op]','">'._AT('view_entire_post').'</a>',$text);\r
 375         \r
 376                 $text = str_replace('[head1]','<h2>',$text);\r
 377                 $text = str_replace('[/head1]','</h2>',$text);\r
 378         \r
 379                 $text = str_replace('[head2]','<h3>',$text);\r
 380                 $text = str_replace('[/head2]','</h3>',$text);\r
 381         \r
 382                 $text = str_replace('[cid]',$_base_path.'content.php?_cid='.$_SESSION['s_cid'],$text);\r
 383         \r
 384                 global $sequence_links, $_course_id, $_content_id;\r
 385                 if ($_course_id > 0 && !isset($sequence_links) && $_content_id > 0) {\r
 386                         global $contentManager;\r
 387                         $sequence_links = $contentManager->generateSequenceCrumbs($_content_id);\r
 388                 }\r
 389                 if (isset($sequence_links['previous']) && $sequence_links['previous']['url']) {\r
 390                         $text = str_replace('[pid]', $sequence_links['previous']['url'], $text);\r
 391                 }\r
 392                 if (isset($sequence_links['next']) && $sequence_links['next']['url']) {\r
 393                         $text = str_replace('[nid]', $sequence_links['next']['url'], $text);\r
 394                 }\r
 395                 if (isset($sequence_links['resume']) && $sequence_links['resume']['url']) {\r
 396                         $text = str_replace('[nid]', $sequence_links['resume']['url'], $text);\r
 397                 }\r
 398                 if (isset($sequence_links['first']) && $sequence_links['first']['url']) {\r
 399                         $text = str_replace('[fid]', $sequence_links['first']['url'], $text);\r
 400                 }\r
 401         \r
 402                 /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 403             $html = !$html ? 0 : 1;\r
 404             \r
 405                 // little hack added by greg to add syntax highlighting without using <?php \?\>\r
 406                 \r
 407                 $text = str_replace("[code]","[code]<?php",$text);\r
 408                 $text = str_replace("[/code]","?>[/code]",$text);\r
 409         \r
 410                 $text = preg_replace("/\[code\]\s*(.*)\s*\[\\/code\]/Usei", "ContentUtility::highlightCode(ContentUtility::fixQuotes('\\1'), $html)", $text);\r
 411                 // now remove the <?php added above and leave the syntax colour behind.\r
 412                 $text = str_replace("&lt;?php", "", $text);\r
 413                 $text = str_replace("?&gt;", "", $text);\r
 414         \r
 415                 return $text;\r
 416         }\r
 417 \r
 418         /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 419         private static function highlightCode($code, $html) {\r
 420                 // XHTMLize PHP highlight_string output until it gets fixed in PHP\r
 421                 static $search = array(\r
 422                         '<br>',\r
 423                         '<font',\r
 424                         '</font>',\r
 425                         'color="');\r
 426         \r
 427                 static $replace = array(\r
 428                         '<br />',\r
 429                         '<span',\r
 430                         '</span>',\r
 431                         'style="color:');\r
 432                 if (!$html) {\r
 433                         $code = str_replace('&lt;', '<', $code);\r
 434                         $code = str_replace("\r", '', $code);\r
 435                 }\r
 436         \r
 437                 return str_replace($search, $replace, highlight_string($code, true));\r
 438         }\r
 439         \r
 440         /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 441         private static function fixQuotes($text){\r
 442                 return str_replace('\\"', '"', $text);\r
 443         }\r
 444 \r
 445         public static function imageReplace($text) {\r
 446                 /* image urls do not require http:// */\r
 447                 \r
 448         //      $text = eregi_replace("\[image(\|)?([[:alnum:][:space:]]*)\]" .\r
 449         //                                               "[:space:]*" .\r
 450         //                                               "([[:alnum:]#?/&=:\"'_.-]+)" .\r
 451         //                                               "[:space:]*" .\r
 452         //                                               "((\[/image\])|(.*\[/image\]))",\r
 453         //                                "<img src=\"\\3\" alt=\"\\2\" />",\r
 454         //                                $text);\r
 455                  \r
 456                 $text = preg_replace("/\[image(\|)?([a-zA-Z0-9\s]*)\]".\r
 457                                      "[\s]*".\r
 458                                      "([a-zA-Z0-9\#\?\/\&\=\:\\\"\'\_\.\-]+)[\s]*".\r
 459                                      "((\[\/image\])|(.*\[\/image\]))/i",\r
 460                                           "<img src=\"\\3\" alt=\"\\2\" />",\r
 461                                           $text);\r
 462                                           \r
 463                 return $text;\r
 464         }\r
 465         \r
 466         private static function formatFinalOutput($text, $nl2br = true) {\r
 467                 global $_base_path;\r
 468         \r
 469                 $text = str_replace('CONTENT_DIR/', '', $text);\r
 470                 if ($nl2br) {\r
 471                         return nl2br(ContentUtility::imageReplace(ContentUtility::makeClickable(ContentUtility::myCodes(' '.$text, false))));\r
 472                 }\r
 473         \r
 474                 return ContentUtility::imageReplace(ContentUtility::makeClickable(ContentUtility::myCodes(' '.$text, true)));\r
 475         }\r
 476 \r
 477         /**\r
 478         * This function converts the input string into AContent html content string \r
 479         * @access  public\r
 480         * @param   $input: input string\r
 481         *          $html: whether the input is in html\r
 482         * @return  converted AContent html content string\r
 483         * @author  Cindy Qi Li\r
 484         */\r
 485         public static function formatContent($input, $html = 0) {\r
 486                 global $_base_path, $_config;\r
 487         \r
 488                 if (!$html) {\r
 489                         $input = str_replace('<', '&lt;', $input);\r
 490                         $input = str_replace('&lt;?php', '<?php', $input); // for bug #2087\r
 491                 } elseif ($html==2) {\r
 492                         $output = '<iframe width="100%" frameborder="0" id="content_frame" marginheight="0" marginwidth="0" src="'.$input.'"></iframe>';\r
 493                         $output .=      '<script type="text/javascript">\r
 494                                                 function resizeIframe() {\r
 495                                                         var height = document.documentElement.clientHeight;\r
 496                                                         \r
 497                                                         // not sure how to get this dynamically\r
 498                                                         height -= 20; /* whatever you set your body bottom margin/padding to be */\r
 499                                                         \r
 500                                                         document.getElementById(\'content_frame\').style.height = height +"px";\r
 501                                                         \r
 502                                                 };\r
 503                                                 document.getElementById(\'content_frame\').onload = resizeIframe;\r
 504                                                 window.onresize = resizeIframe;\r
 505                                                 </script>';\r
 506                         return $output;\r
 507                 }\r
 508         \r
 509                 /* Commented by Cindy Qi Li on Jan 12, 2010\r
 510                  * AContent does not support glossary\r
 511                 // do the glossary search and replace:\r
 512                 if (is_array($glossary)) {\r
 513                         foreach ($glossary as $k => $v) {\r
 514                                 $k = urldecode($k);\r
 515                                 $v = str_replace("\n", '<br />', $v);\r
 516                                 $v = str_replace("\r", '', $v);\r
 517         \r
 518                                 // escape special characters\r
 519                                 $k = preg_quote($k);\r
 520         \r
 521                                 $k = str_replace('&lt;', '<', $k);\r
 522                                 $k = str_replace('/', '\/', $k);\r
 523         \r
 524                                 $original_term = $k;\r
 525                                 $term = $original_term;\r
 526         \r
 527                                 $term = '(\s*'.$term.'\s*)';\r
 528                                 $term = str_replace(' ','((<br \/>)*\s*)', $term); \r
 529         \r
 530                                 $def = htmlspecialchars($v, ENT_QUOTES, 'UTF-8');               \r
 531                                 if ($simple) {\r
 532                                         $input = preg_replace\r
 533                                                         ("/(\[\?\])$term(\[\/\?\])/i",\r
 534                                                         '<a href="'.$simple.'glossary.html#'.urlencode($original_term).'" target="body" class="at-term">\\2</a>',\r
 535                                                         $input);\r
 536                                 } else {\r
 537                                         $input = preg_replace\r
 538                                                         ("/(\[\?\])$term(\[\/\?\])/i",\r
 539                                                         '\\2<sup><a class="tooltip" href="'.$_base_path.'glossary/index.php?g_cid='.$_SESSION['s_cid'].htmlentities(SEP).'w='.urlencode($original_term).'#term" title="'.addslashes($original_term).': '.$def.'"><span style="color: blue; text-decoration: none;font-size:small; font-weight:bolder;">?</span></a></sup>',$input);\r
 540                                 }\r
 541                         }\r
 542                 } else if (!$user_glossary) {\r
 543                         $input = str_replace(array('[?]','[/?]'), '', $input);\r
 544                 }\r
 545                 */\r
 546 \r
 547                 \r
 548                 $input = str_replace('CONTENT_DIR', '', $input);\r
 549         \r
 550                 if (isset($_config['latex_server']) && $_config['latex_server']) {\r
 551                         // see: http://www.forkosh.com/mimetex.html\r
 552                         $input = preg_replace('/\[tex\](.*?)\[\/tex\]/sie', "'<img src=\"'.\$_config['latex_server'].rawurlencode('$1').'\" align=\"middle\">'", $input);\r
 553                 }\r
 554         \r
 555                 if ($html) {\r
 556                         $x = ContentUtility::formatFinalOutput($input, false);\r
 557                         return $x;\r
 558                 }\r
 559         \r
 560                 $output = ContentUtility::formatFinalOutput($input);\r
 561         \r
 562                 $output = '<p>'.$input.'</p>';\r
 563         \r
 564                 return $output;\r
 565         }\r
 566         \r
 567         /**\r
 568          * This function returns html string of "table of content"\r
 569          * @access: public\r
 570          * @param: $content: a string\r
 571          * @return: a html string of "table of content"\r
 572          */\r
 573         public static function getContentTable($content)\r
 574         {\r
 575                 preg_match_all("/<(h[\d]+)[^>]*>(.*)<\/(\s*)\\1(\s*)>/i", $content, $found_headers, PREG_SET_ORDER);\r
 576                 \r
 577                 if (count($found_headers) == 0) return array("", $content);\r
 578                 else\r
 579                 {\r
 580                         $num_of_headers = 0;\r
 581         \r
 582                         for ($i = 0; $i < count($found_headers); $i++)\r
 583                         {\r
 584                                 $div_id = "_header_" . $num_of_headers++;\r
 585                                 \r
 586                                 if ($i == 0)\r
 587                                 {\r
 588                                         $content_table = "<div id=\"toc\">\n<fieldset id=\"toc\"><legend>". _AT("table_of_contents")."</legend>\n";\r
 589                                 }\r
 590         \r
 591                                 $content = str_replace($found_headers[$i][0], '<div id="'.$div_id.'">'.$found_headers[$i][0].'</div>', $content);\r
 592                                 $content_table .= '<a href="'.$_SERVER["REQUEST_URI"].'#'.$div_id.'" class="'.$found_headers[$i][1].'">'. $found_headers[$i][2]."</a>\n";\r
 593         \r
 594                                 if ($i == count($found_headers) - 1)\r
 595                                 {\r
 596                                         $content_table .= "</fieldset></div><br />";\r
 597                                 }\r
 598                         }\r
 599                         return array($content_table, $content);\r
 600                 }\r
 601         }\r
 602         \r
 603         /**\r
 604          * This function returns an array of content tools' shortcuts\r
 605          * @access: public\r
 606          * @param: $content_row: an array of the current content information\r
 607          * @return: an array of all the tool short cuts that apply to the current content or content folder\r
 608          */\r
 609         public static function getToolShortcuts($content_row)\r
 610         {\r
 611                 global $_current_user, $_base_href, $contentManager, $_course_id;\r
 612                 \r
 613                 if (((!$content_row['content_parent_id'] && ($_SESSION['packaging'] == 'top'))\r
 614                       || ($_SESSION['packaging'] == 'all'))\r
 615                           || (isset($_current_user) && $_current_user->isAuthor($_course_id))) {\r
 616                 \r
 617                         $tool_shortcuts[] = array(\r
 618                                   'title' => _AT('export_content_in_cp'), \r
 619                                   'url' => $_base_href . 'home/ims/ims_export.php?_cid='.$content_row['content_id'],\r
 620                                   'icon' => $_base_href . 'themes/'.$_SESSION['prefs']['PREF_THEME'].'/images/export.png');\r
 621                         $tool_shortcuts[] = array(\r
 622                                   'title' => _AT('export_content_in_cc'), \r
 623                                   'url' => $_base_href . 'home/imscc/ims_export.php?_cid='.$content_row['content_id'].SEP.'to_a4a=1',\r
 624                                   'icon' => $_base_href . 'themes/'.$_SESSION['prefs']['PREF_THEME'].'/images/export_cc.png');\r
 625                 }\r
 626                 \r
 627                 if (isset($_current_user) && $_current_user->isAuthor($_course_id)) {\r
 628                         if ($content_row['content_type'] == CONTENT_TYPE_CONTENT || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 629                                 $tool_shortcuts[] = array(\r
 630                                           'title' => _AT('edit_this_page'),   \r
 631                                            'url' => $_base_href . 'home/editor/edit_content.php?_cid='.$content_row['content_id'],\r
 632                                           'icon' => $_base_href . 'images/medit.gif');\r
 633                         }\r
 634                 \r
 635                         $tool_shortcuts[] = array(\r
 636                           'title' => _AT('add_sibling_folder'), \r
 637                           'url' => $_base_href .\r
 638                                 'home/editor/edit_content_folder.php?pid='.$contentManager->_menu_info[$content_row['content_id']]['content_parent_id'].SEP.'_course_id='.$_course_id,\r
 639                            'icon' => $_base_href . 'images/add_sibling_folder.gif');\r
 640 \r
 641                         if ($content_row['content_type'] == CONTENT_TYPE_FOLDER || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 642                                 $tool_shortcuts[] = array(\r
 643                                   'title' => _AT('add_sub_folder'), \r
 644                                   'url' => $_base_href .\r
 645                                         'home/editor/edit_content_folder.php?_course_id='.$_course_id.SEP.'pid='.$content_row['content_id'],\r
 646                                    'icon' => $_base_href . 'images/add_sub_folder.gif');\r
 647                         }\r
 648                         \r
 649                         $tool_shortcuts[] = array(\r
 650                           'title' => _AT('add_sibling_page'), \r
 651                           'url' => $_base_href .\r
 652                                 'home/editor/edit_content.php?pid='.$contentManager->_menu_info[$content_row['content_id']]['content_parent_id'].SEP.'_course_id='.$_course_id,\r
 653                           'icon' => $_base_href . 'images/add_sibling_page.gif');\r
 654                         \r
 655                         if ($content_row['content_type'] == CONTENT_TYPE_CONTENT || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 656                                 $tool_shortcuts[] = array(\r
 657                                   'title' => _AT('delete_this_page'),   \r
 658                                   'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$content_row['content_id'],\r
 659                                   'icon' => $_base_href . 'images/page_delete.gif');\r
 660                         }\r
 661                         else if ($content_row['content_type'] == CONTENT_TYPE_FOLDER) {\r
 662                                 $tool_shortcuts[] = array(\r
 663                                   'title' => _AT('add_sub_page'),       \r
 664                                   'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$content_row['content_id'],\r
 665                                   'icon' => $_base_href . 'images/add_sub_page.gif');\r
 666                                 \r
 667                                 $tool_shortcuts[] = array(\r
 668                                   'title' => _AT('delete_this_folder'),         \r
 669                                   'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$content_row['content_id'],\r
 670                                   'icon' => $_base_href . 'images/page_delete.gif');\r
 671                         }\r
 672                 }\r
 673                 return $tool_shortcuts;\r
 674 \r
 675 //      if (isset($_current_user) && $_current_user->isAuthor($_course_id)) {\r
 676 //              $shortcuts[] = array('title' => _AT('add_sub_folder'),   'url' => $_base_href . 'home/editor/edit_content_folder.php?_course_id='.$_course_id.'pid='.$cid);\r
 677 //              \r
 678 ////            $shortcuts[] = array('title' => _AT('add_top_page'),     'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id, 'icon' => $_base_href . 'images/page_add.gif');\r
 679 //              if ($contentManager->_menu_info[$cid]['content_parent_id']) {\r
 680 //                      $shortcuts[] = array('title' => _AT('add_sibling_page'), 'url' => $_base_href .\r
 681 //                              'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$contentManager->_menu_info[$cid]['content_parent_id'], 'icon' => $_base_href . 'images/page_add_sibling.gif');\r
 682 //              }\r
 683 //      \r
 684 //              $shortcuts[] = array('title' => _AT('add_sub_page'),     'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$cid);\r
 685 //              $shortcuts[] = array('title' => _AT('delete_this_folder'), 'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$cid, 'icon' => $_base_href . 'images/page_delete.gif');\r
 686 //      }\r
 687         }\r
 688         \r
 689         /**\r
 690         * replace source object with alternatives according to user's preferences\r
 691         * @access       public\r
 692         * @param        $cid:                           content id.\r
 693         * @param        $content:                       the original content page ($content_row['text'], from content.php).\r
 694         * @param    $info_only:         when "true", return the array of info (has_text_alternative, has_audio_alternative, has_visual_alternative, has_sign_lang_alternative)\r
 695         * @param    $only_on_secondary_type: \r
 696         * @return       string                          $content: the content page with the appropriated resources.\r
 697         * @see          $db                             from include/vitals.inc.php\r
 698         * @author       Cindy Qi Li\r
 699         */\r
 700         public static function applyAlternatives($cid, $content, $info_only = false, $only_on_secondary_type = 0){\r
 701                 global $db, $_course_id;\r
 702                 \r
 703                 include_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');\r
 704                 $dao = new DAO();\r
 705                 \r
 706                 $video_exts = array("mpg", "avi", "wmv", "mov", "swf", "mp3", "wav", "ogg", "mid", "mp4", "flv");\r
 707                 $txt_exts = array("txt", "html", "htm");\r
 708                 $image_exts = array("gif", "bmp", "png", "jpg", "jpeg", "png", "tif");\r
 709                 $only_on_secondary_type = intval($only_on_secondary_type);\r
 710                                 \r
 711                 // intialize the 4 returned values when $info_only is on\r
 712                 if ($info_only)\r
 713                 {\r
 714                         $has_text_alternative = false;\r
 715                         $has_audio_alternative = false;\r
 716                         $has_visual_alternative = false;\r
 717                         $has_sign_lang_alternative = false;\r
 718                 }\r
 719 \r
 720                 if (!$info_only && !$only_on_secondary_type && \r
 721                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_TEXT']==0) && \r
 722                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_AUDIO']==0) && \r
 723                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_VISUAL']==0)) \r
 724                 {\r
 725                         //No user's preferences related to content format are declared\r
 726                         if (!$info_only) {\r
 727                                 return $content;\r
 728                         } else {\r
 729                                 return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
 730                         }\r
 731                 }\r
 732                 \r
 733                 // get all relations between primary resources and their alternatives\r
 734                 $sql = "SELECT c.content_path, pr.resource, prt.type_id primary_type, sr.secondary_resource, srt.type_id secondary_type\r
 735                           FROM ".TABLE_PREFIX."primary_resources pr, ".\r
 736                                  TABLE_PREFIX."primary_resources_types prt,".\r
 737                                  TABLE_PREFIX."secondary_resources sr,".\r
 738                                  TABLE_PREFIX."secondary_resources_types srt,".\r
 739                                  TABLE_PREFIX."content c\r
 740                          WHERE pr.content_id=".$cid."\r
 741                                AND pr.primary_resource_id = prt.primary_resource_id\r
 742                                AND pr.primary_resource_id = sr.primary_resource_id\r
 743                                AND sr.language_code='".$_SESSION['lang']."'\r
 744                                AND sr.secondary_resource_id = srt.secondary_resource_id\r
 745                            AND pr.content_id = c.content_id";\r
 746                 if ($only_on_secondary_type > 0) {\r
 747                         $sql .= " AND srt.type_id=".$only_on_secondary_type;\r
 748                 }\r
 749                 $sql .= " ORDER BY pr.primary_resource_id, prt.type_id";\r
 750                 \r
 751                 $rows = $dao->execute($sql);\r
 752         \r
 753                 if (!is_array($rows)) {\r
 754                         if (!$info_only) {\r
 755                                 return $content;\r
 756                         } else {\r
 757                                 return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
 758                         }\r
 759                 }\r
 760                 \r
 761                 foreach ($rows as $row) \r
 762                 {\r
 763                         if ($info_only || $only_on_secondary_type ||\r
 764                             ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_TEXT']==1 && $row['primary_type']==3 &&\r
 765                             ($_SESSION['prefs']['PREF_ALT_TO_TEXT']=="audio" && $row['secondary_type']==1 || \r
 766                              $_SESSION['prefs']['PREF_ALT_TO_TEXT']=="visual" && $row['secondary_type']==4 || \r
 767                              $_SESSION['prefs']['PREF_ALT_TO_TEXT']=="sign_lang" && $row['secondary_type']==2)) ||\r
 768                              \r
 769                              ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_AUDIO']==1 && $row['primary_type']==1 &&\r
 770                              ($_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="visual" && $row['secondary_type']==4 || \r
 771                               $_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="text" && $row['secondary_type']==3 || \r
 772                               $_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="sign_lang" && $row['secondary_type']==2)) ||\r
 773                               \r
 774                              ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_VISUAL']==1 && $row['primary_type']==4 &&\r
 775                              ($_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="audio" && $row['secondary_type']==1 || \r
 776                               $_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="text" && $row['secondary_type']==3 || \r
 777                               $_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="sign_lang" && $row['secondary_type']==2))\r
 778                             )\r
 779                         {\r
 780                                 $ext = substr($row['secondary_resource'], strrpos($row['secondary_resource'], '.')+1);\r
 781                                 \r
 782                                 // alternative is video\r
 783                                 if (in_array($ext, $video_exts))\r
 784                                         $target = '[media]'.$row['secondary_resource'].'[/media]';\r
 785                                 // a text primary to be replaced by a visual alternative \r
 786                                 else if (in_array($ext, $txt_exts))\r
 787                                 {\r
 788                                         if ($row['content_path'] <> '') \r
 789                                                 $file_location = $row['content_path'].'/'.$row['secondary_resource'];\r
 790                                         else \r
 791                                                 $file_location = $row['secondary_resource'];\r
 792                                         \r
 793                                         $file = TR_CONTENT_DIR.$_SESSION['course_id'] . '/'.$file_location;\r
 794                                         $target = '<br />'.file_get_contents($file);\r
 795                                         \r
 796                                         // check whether html file\r
 797                                         if (preg_match('/.*\<html.*\<\/html\>.*/s', $target))\r
 798                                         { // is a html file, use iframe to display\r
 799                                                 // get real path to the text file\r
 800                                                 if (defined('TR_FORCE_GET_FILE') && TR_FORCE_GET_FILE) {\r
 801                                                         $course_base_href = 'get.php/';\r
 802                                                 } else {\r
 803                                                         $course_base_href = 'content/' . $_SESSION['course_id'] . '/';\r
 804                                                 }\r
 805                 \r
 806                                                 $file = TR_BASE_HREF . $course_base_href.$file_location;\r
 807                                                         \r
 808                                                 $target = '<iframe width="100%" frameborder="0" class="autoHeight" scrolling="auto" src="'.$file.'"></iframe>';\r
 809                                         }\r
 810                                         else\r
 811                                         { // is a text file, insert/replace into content\r
 812                                                 $target = nl2br($target);\r
 813                                         }\r
 814                                 } \r
 815                                 else if (in_array($ext, $image_exts))\r
 816                                         $target = '<img border="0" alt="'._AT('alternate_text').'" src="'.$row['secondary_resource'].'"/>';\r
 817                                 // otherwise\r
 818                                 else\r
 819                                         $target = '<p><a href="'.$row['secondary_resource'].'">'.$row['secondary_resource'].'</a></p>';\r
 820         \r
 821                                 // replace or append the target alternative to the source\r
 822                                 if (($row['primary_type']==3 && $_SESSION['prefs']['PREF_ALT_TO_TEXT_APPEND_OR_REPLACE'] == 'replace') ||\r
 823                                         ($row['primary_type']==1 && $_SESSION['prefs']['PREF_ALT_TO_AUDIO_APPEND_OR_REPLACE']=='replace') ||\r
 824                                         ($row['primary_type']==4 && $_SESSION['prefs']['PREF_ALT_TO_VISUAL_APPEND_OR_REPLACE']=='replace'))\r
 825                                         $pattern_replace_to = '${1}'.$target.'${3}';\r
 826                                 else\r
 827                                         $pattern_replace_to = '${1}${2}'.$target.'${3}';\r
 828         \r
 829                                 // *** Alternative replace/append starts from here ***\r
 830                                 $img_processed = false;    // The indicator to tell the source image is found (or not) \r
 831                                                            // and processed (or not) in an <img> tag. If found and processed, \r
 832                                                            // SKIP the found/process for <a> tag because the source is a image\r
 833                                                            // and <a> is very likely the tag wrapping around <img>\r
 834 \r
 835                                 // append/replace target alternative to [media]source[/media]\r
 836                                 if (preg_match("/".preg_quote("[media").".*".preg_quote("]".$row['resource']."[/media]", "/")."/sU", $content))\r
 837                                 {\r
 838                                         if (!$info_only) {\r
 839                                                 $content = preg_replace("/(.*)(".preg_quote("[media").".*".preg_quote("]".$row['resource']."[/media]", "/").")(.*)/sU", \r
 840                                              $pattern_replace_to, $content);\r
 841                                         } else {\r
 842                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 843                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 844                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 845                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 846                                         }\r
 847                                 }\r
 848                                 \r
 849                                 // append/replace target alternative to <img ... src="source" ...></a>\r
 850                                 if (preg_match("/\<img.*src=\"".preg_quote($row['resource'], "/")."\".*\/\>/sU", $content))\r
 851                                 {\r
 852                                         $img_processed = true;\r
 853                                         if (!$info_only) {\r
 854                                                 $content = preg_replace("/(.*)(\<img.*src=\"".preg_quote($row['resource'], "/")."\".*\/\>)(.*)/sU", \r
 855                                                         $pattern_replace_to, $content);\r
 856                                         } else {\r
 857                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 858                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 859                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 860                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 861                                         }\r
 862                                 }\r
 863                                 \r
 864                                 // append/replace target alternative to <a>...source...</a> or <a ...source...>...</a>\r
 865                                 // skip this "if" when the source object has been processed in aboved <img> tag\r
 866                                 if (!$img_processed && preg_match("/\<a.*".preg_quote($row['resource'], "/").".*\<\/a\>/sU", $content))\r
 867                                 {\r
 868                                         if (!$info_only) {\r
 869                                                 $content = preg_replace("/(.*)(\<a.*".preg_quote($row['resource'], "/").".*\<\/a\>)(.*)/sU", \r
 870                                                         $pattern_replace_to, $content);\r
 871                                         } else {\r
 872                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 873                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 874                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 875                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 876                                         }\r
 877                                 }\r
 878         \r
 879                                 // append/replace target alternative to <object ... source ...></object>\r
 880                                 if (preg_match("/\<object.*".preg_quote($row['resource'], "/").".*\<\/object\>/sU", $content))\r
 881                                 {\r
 882                                         if (!$info_only) {\r
 883                                                 $content = preg_replace("/(.*)(\<object.*".preg_quote($row['resource'], "/").".*\<\/object\>)(.*)/sU", \r
 884                                                         $pattern_replace_to, $content);\r
 885                                         } else {\r
 886                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 887                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 888                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 889                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 890                                         }\r
 891                                 }\r
 892         \r
 893                                 // append/replace target alternative to <embed ... source ...>\r
 894                                 if (preg_match("/\<embed.*".preg_quote($row['resource'], "/").".*\>/sU", $content))\r
 895                                 {\r
 896                                         if (!$info_only) {\r
 897                                                 $content = preg_replace("/(.*)(\<embed.*".preg_quote($row['resource'], "/").".*\>)(.*)/sU", \r
 898                                                         $pattern_replace_to, $content);\r
 899                                         } else {\r
 900                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 901                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 902                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 903                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 904                                         }\r
 905                                 }\r
 906                         }\r
 907                 }\r
 908                 \r
 909                 if (!$info_only) {\r
 910                         return $content;\r
 911                 } else {\r
 912                         return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
 913                 }\r
 914         }       \r
 915                 \r
 916         /**\r
 917          * This function save the last content_id accessed by current user on a course into db and set $_SESSION['s_cid']\r
 918          * @access: public\r
 919          * @param: $content_id\r
 920          * @return: save $content_id, the last visited one of the current user, into db and session\r
 921          */\r
 922         public static function saveLastCid($content_id)\r
 923         {\r
 924                 global $_course_id;\r
 925                 \r
 926                 if (!$content_id || !isset($_SESSION['user_id'])) return;\r
 927                 \r
 928                 include_once(TR_INCLUDE_PATH.'classes/DAO/UserCoursesDAO.class.php');\r
 929                 \r
 930                 $userCoursesDAO = new UserCoursesDAO();\r
 931                 if ($userCoursesDAO->isExist($_SESSION['user_id'], $_course_id))\r
 932                 {\r
 933                         $userCoursesDAO->UpdateLastCid($_SESSION['user_id'], $_course_id, $content_id);\r
 934                         $_SESSION['s_cid'] = $content_id;\r
 935                 }\r
 936         }\r
 937 }\r
 938 ?>