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Modify URL param

/ Published in: PHP
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Current URL http://www.example.com/page.php?p=5&show=list&style=2 and after
$url = modify_url(array('p' => 4, 'show' => 'column'));
URL will become http://www.example.com/page.php?p=4&show=column&style=2

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  1. function modify_url($mod){
  2.     $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
  3.     $query = explode("&", $_SERVER['QUERY_STRING']);
  4.     if (!$_SERVER['QUERY_STRING']) {$queryStart = "?";} else {$queryStart = "&";}
  5.     // modify/delete data
  6.     foreach($query as $q)
  7.     {
  8.         list($key, $value) = explode("=", $q);
  9.         if(array_key_exists($key, $mod))
  10.         {
  11.             if($mod[$key])
  12.             {
  13.                 $url = preg_replace('/'.$key.'='.$value.'/', $key.'='.$mod[$key], $url);
  14.             }
  15.             else
  16.             {
  17.                 $url = preg_replace('/&?'.$key.'='.$value.'/', '', $url);
  18.             }
  19.         }
  20.     }
  21.     // add new data
  22.     foreach($mod as $key => $value)
  23.     {
  24.         if($value && !preg_match('/'.$key.'=/', $url))
  25.         {
  26.             $url .= $queryStart.$key.'='.$value;
  27.         }
  28.     }
  29.     return $url;
  30. }

URL: http://www.phpsnippets.info/easily-modify-url-parameters

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