Assumed you have a query string like this  : param1=2549&appname=appName1&appname=appName2&appname=appName3&appname=appName4&appname=appName5&apptype=thetype&idsess=1231324567980147dzeze55sd4&action=myaction

You can do this :

public static function getMultipleParameters()
    {
        $query = $_SERVER['QUERY_STRING'];
        $vars = array();
        $second = array();
        foreach (explode('&', $query) as $pair) {
            list($key, $value) = explode('=', $pair);
            if('' == trim($value)){
                continue;
            }

            if (array_key_exists($key, $vars)) {
                if (!array_key_exists($key, $second))
                    $second[$key][] .= $vars[$key];
                $second[$key][] = $value;
            } else {
                $vars[$key] = urldecode($value);
            }
        }
        return array_merge($vars, $second);
    }

That gives :

array (
  'param1' => '2549',
  'appname' => 
      array (
        0 => 'appName1',
        1 => 'appName2',
        2 => 'appName3',
        3 => 'appName4',
        4 => 'appName5',
  ),
  'apptype' => 'thetype',
  'idsess' => '1231324567980147dzeze55sd4',
  'action' => 'myaction',
);

Hope that helps ;)

Assumed you have a query string like this:

param1=2549&appname=appName1&appname=appName2&appname=appName3&appname=appName4&appname=appName5&apptype=thetype&idsess=1231324567980147dzeze55sd4&action=myaction

You can do this :

public static function getMultipleParameters()
    {
        $query = $_SERVER['QUERY_STRING'];
        $vars = array();
        $second = array();
        foreach (explode('&', $query) as $pair) {
            list($key, $value) = explode('=', $pair);
            if('' == trim($value)){
                continue;
            }

            if (array_key_exists($key, $vars)) {
                if (!array_key_exists($key, $second))
                    $second[$key][] .= $vars[$key];
                $second[$key][] = $value;
            } else {
                $vars[$key] = urldecode($value);
            }
        }
        return array_merge($vars, $second);
    }

That gives :

array (
  'param1' => '2549',
  'appname' => 
      array (
        0 => 'appName1',
        1 => 'appName2',
        2 => 'appName3',
        3 => 'appName4',
        4 => 'appName5',
  ),
  'apptype' => 'thetype',
  'idsess' => '1231324567980147dzeze55sd4',
  'action' => 'myaction',
);

Hope that helps ;)