function clearSelected(){
    var elements = document.getElementById("ddBusinessCategory").options;
 
    for(var i = 0; i < elements.length; i++){
      if(elements[i].selected)
        elements[i].selected = false;
    }
  }

ErrorDocument 404 /index.php   //вписываем в .htaccess

$url = $_SERVER['REQUEST_URI'];

echo $url;