Apache rewrite query string (checkbox array)

4 comments

1. Here’s a short php script that creates the query string that you want. It’s best not to do this part using mod_rewrite, because it’s simply outside of that scope:

   <?php
   
   $ret = "";
   foreach($_GET as $key=>$val) {
     if(is_array($val)) {
       // Create the comma separated string
       $value = $val[0];
       $length = count($val);
       for($i=1; $i < $length; $i++) {
         $value .= ',' . $val[$i];
       }
       $ret .= "$key=$value&";
     } else {
       $ret .= "$key=$val&";
     }
   }
   
   // Remove last '&'
   $ret = substr($ret , 0, strlen($ret)-1);
   
   // Redirect the browser
   header('HTTP/1.1 302 Moved');
   header("Location: /test.php?" . $ret);
   
   ?>
   

   If you save that script as /rewrite.php, for example, then you can include these rules in the .htaccess file to reroute requests with query strings containing arrays to /rewrite.php:

   RewriteCond %{QUERY_STRING} []
   RewriteRule ^test.php /rewrite.php [L,QSA]
   

   Then the rewrite.php script will rewrite the query string and redirect the browser with the concatenated query string.

   Log in to Reply

2. • DEMO: http://so.devilmaycode.it/apache-rewrite-query-string-checkbox-array/

   if (preg_match('/[][]/',$_SERVER['QUERY_STRING'])) {
     foreach ($_GET as $key => &$val) {
       $_GET[$key] = is_array($val) ? implode(',', $val) : $val;
     }
     header('Location: test.php?'.rawurldecode(http_build_query(array_filter($_GET))));
   }
   

   Log in to Reply

3. test.php?cat1=18,687,5&xxx=3,1&yyy=6

   try to insert this function before your code:

   url_parsestring2array(& $_GET);
   
   function url_parsestring2array($args)
   {
       if (empty($args) || !is_array($args) || !$args) {
           return;
       }
       foreach ($args as $key => $val) {
           $tmp = explode(',', $val);
           if (count($tmp) > 1) {
               $args[$key] = $tmp;
           }
       }
   }
   
   var_dump($_GET);
   

   will print

   array(3) { [“cat1”]=> array(3) { [0]=> string(2) “18” [1]=> string(3)
   “687” [2]=> string(1) “5” } [“xxx”]=> array(2) { [0]=> string(1) “3”
   [1]=> string(1) “1” } [“yyy”]=> string(1) “6” }

   Log in to Reply

4. I found a solution to do this transformation without modifying the code.

   In the httpd.conf (in my VirtualHost section) I define a rewrite map:

   RewriteMap programmap prg:/var/www/localhost/htdocs/chg.php
   

   Then in the .htaccess I set the following rules:

   RewriteEngine On
   
   RewriteCond %{QUERY_STRING} (.*)
   RewriteRule ^(script.php) $1?${programmap:%1} [L]
   

   $1 stand for first “()” in RewriteRule

   %1 stand for first “()” in RewriteCond

   Then I write this script “/var/www/localhost/htdocs/chg.php” (in PHP but can be in C, Perl, or whatelse):

   #!/usr/bin/php -f
   <?php
   $pos1 =  2;
   $pos2 =  $pos1 + 1;
   $reg = '/(([a-z0-9_]+)[]=([^&]*))/';
   while(true){
           $res=array();
           $buff = trim(fgets(STDIN));
           if(feof(STDIN)){
                   break;
           }
           $r = preg_match_all($reg, $buff, $match,PREG_SET_ORDER);
           if($r){
                   foreach($match as $row){
                           if(!isset($res[$row[$pos1]])){
                                   $res[$row[$pos1]] = $row[$pos1]."=".$row[$pos2];
                           } else {
                                   $res[$row[$pos1]] .= ",".$row[$pos2];
                           }
                   }
                   $out=join('&',$res);
           } else {
                   $out=$buff;
           }
           echo "$outn";
   }
   

   Log in to Reply