include/classes/UrlRewrite/ForumsUrl.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2010                                              */
   6 /* Inclusive Design Institute                                           */
   7 /* http://atutor.ca                                                     */
   8 /* This program is free software. You can redistribute it and/or        */
   9 /* modify it under the terms of the GNU General Public License          */
  10 /* as published by the Free Software Foundation.                        */
  11 /************************************************************************/
  12 // $Id$
  13 /**
  14 * UrlParser
  15 * Class for rewriting pretty urls on forums.
  16 * @access       public
  17 * @author       Harris Wong
  18 * @package      UrlParser
  19 */
  20 class ForumsUrl {
  21         // constructor
  22         function ForumsUrl() {
  23                 $this->rule = array(0=>'fid', 1=>'pid');
  24         }
  25
  26
  27         /**
  28          * Construct pretty url by the given query string.
  29          */
  30         function constructPrettyUrl($query){
  31                 if (empty($query)){
  32                         return '';
  33                 }
  34
  35                 //If this is already a pretty url,but without mod_apache rule
  36                 //unwrap it and reconstruct
  37                 if (is_array($query)){
  38                         $new_query = '';
  39                         foreach($query as $fk=>$fv){
  40                                 if      (preg_match('/\.php/', $fv)==1){
  41                                         continue;       //skip the php file
  42                                 }
  43
  44                                 //check if this is part of the rule, if so,add it, o/w ignore
  45                                 if (array_search($fv, $this->rule)!==FALSE){
  46                                         $new_query .= $fv . '=' . $query[$fk+1] . SEP;
  47                                 } elseif (preg_match('/([0-9]+)\.html/', $fv, $matches)==1){
  48                                         $new_query .= 'page=' . $matches[1] . SEP;
  49                                 }
  50                         }
  51                         $query = $new_query;    //done
  52                 }
  53
  54                 $temp = explode(SEP, $query);
  55                 foreach ($temp as $index=>$attributes){
  56                         if(empty($attributes)){
  57                                 //skip the ones that are empty.
  58                                 continue;
  59                         }
  60                         list($key, $value) = preg_split('/\=/', $attributes, 2);
  61                         $query_parts[$key] = $value;
  62                 }
  63
  64                 $query_string = '';
  65
  66                 //construct pretty url on mapping
  67                 foreach ($this->rule as $key=>$value){
  68
  69                         //if this value is empty, the url construction should quit.
  70                         if ($query_parts[$value] ==''){
  71                                 break;
  72                         }
  73                         $url .= $query_parts[$value].'/';
  74
  75                         //if the query parts are not in the defined rules, set it back to query string again
  76                         if ($query_parts[$this->rule[$key]]!=''){
  77                                 $query_parts[$this->rule[$key]] = '';
  78                         }
  79                 }
  80
  81                 //Go through the query_parts again, and for those values that are not empty
  82                 // add it to the querystring
  83                 foreach($query_parts as $key=>$value){
  84                         //paginator are handle differently
  85                         if ($value!='' && $key!='page'){
  86                                 $query_string .= $key.'='.$value.SEP;
  87                         }
  88                 }
  89                 //take out the last sep.
  90                 $query_string = substr($query_string, 0, -1);
  91
  92                 //handle paginators
  93                 if ($query_parts['page']!=''){
  94                         $url .= $query_parts['page'].'.html';
  95                 }
  96
  97                 //append query string at the back
  98                 if ($query_string!=''){
  99                         $url .= '?'.$query_string;
 100                 }
 101
 102                 return $url;
 103         }
 104 }
 105 ?>