Create URL friendly string from Czech text in PHP

create-url-friendly-string.php

<?php 
public function createUrl($string)
{
      $output = preg_replace('~[^\\pL0-9_]+~u', '-', $string);
      $output = trim($output, '-');
      $output = iconv('UTF-8', 'us-ascii//TRANSLIT', $output);
      $output = strtolower($output);
      $output = preg_replace('~[^-a-z0-9_]+~', '', $output);

      return $output;
}