include/classes/UrlRewrite/ForumsUrl.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2008 by Greg Gay, Joel Kronenberg & Heidi Hazelton*/
   6 /* Adaptive Technology Resource Centre / University of Toronto                  */
   7 /* http://atutor.ca                                                                                                             */
   8 /*                                                                                                                                              */
   9 /* This program is free software. You can redistribute it and/or                */
  10 /* modify it under the terms of the GNU General Public License                  */
  11 /* as published by the Free Software Foundation.                                                */
  12 /************************************************************************/
  13 // $Id$
  14 /**
  15 * UrlParser
  16 * Class for rewriting pretty urls on forums.
  17 * @access       public
  18 * @author       Harris Wong
  19 * @package      UrlParser
  20 */
  21 class ForumsUrl {
  22         // constructor
  23         function ForumsUrl() {
  24                 $this->rule = array(0=>'fid', 1=>'pid');
  25         }
  26
  27
  28         /**
  29          * Construct pretty url by the given query string.
  30          */
  31         function constructPrettyUrl($query){
  32                 if (empty($query)){
  33                         return '';
  34                 }
  35
  36                 //If this is already a pretty url,but without mod_apache rule
  37                 //unwrap it and reconstruct
  38                 if (is_array($query)){
  39                         $new_query = '';
  40                         foreach($query as $fk=>$fv){
  41                                 if      (preg_match('/\.php/', $fv)==1){
  42                                         continue;       //skip the php file
  43                                 }
  44
  45                                 //check if this is part of the rule, if so,add it, o/w ignore
  46                                 if (array_search($fv, $this->rule)!==FALSE){
  47                                         $new_query .= $fv . '=' . $query[$fk+1] . SEP;
  48                                 } elseif (preg_match('/([0-9]+)\.html/', $fv, $matches)==1){
  49                                         $new_query .= 'page=' . $matches[1] . SEP;
  50                                 }
  51                         }
  52                         $query = $new_query;    //done
  53                 }
  54
  55                 $temp = explode(SEP, $query);
  56                 foreach ($temp as $index=>$attributes){
  57                         if(empty($attributes)){
  58                                 //skip the ones that are empty.
  59                                 continue;
  60                         }
  61                         list($key, $value) = preg_split('/\=/', $attributes, 2);
  62                         $query_parts[$key] = $value;
  63                 }
  64
  65                 $query_string = '';
  66
  67                 //construct pretty url on mapping
  68                 foreach ($this->rule as $key=>$value){
  69
  70                         //if this value is empty, the url construction should quit.
  71                         if ($query_parts[$value] ==''){
  72                                 break;
  73                         }
  74                         $url .= $query_parts[$value].'/';
  75
  76                         //if the query parts are not in the defined rules, set it back to query string again
  77                         if ($query_parts[$this->rule[$key]]!=''){
  78                                 $query_parts[$this->rule[$key]] = '';
  79                         }
  80                 }
  81
  82                 //Go through the query_parts again, and for those values that are not empty
  83                 // add it to the querystring
  84                 foreach($query_parts as $key=>$value){
  85                         //paginator are handle differently
  86                         if ($value!='' && $key!='page'){
  87                                 $query_string .= $key.'='.$value.SEP;
  88                         }
  89                 }
  90                 //take out the last sep.
  91                 $query_string = substr($query_string, 0, -1);
  92
  93                 //handle paginators
  94                 if ($query_parts['page']!=''){
  95                         $url .= $query_parts['page'].'.html';
  96                 }
  97
  98                 //append query string at the back
  99                 if ($query_string!=''){
 100                         $url .= '?'.$query_string;
 101                 }
 102
 103                 return $url;
 104         }
 105 }
 106 ?>