php slugify / urlize

# PHP slugify

function slugify( $text, $unique_id = null ) {
  $old_locale = setlocale( LC_CTYPE, 0 );
  if( $old_locale != "en_US.UTF-8" ) {
    setlocale( LC_CTYPE, "en_US.UTF-8" );
    $old_locale = null;
  }

  $text = preg_replace('~[^\\pL\d]+~u', '-', $text);
  $text = trim($text, '-');

  if (function_exists('iconv')) { $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text); }

  $text = strtolower($text);
  $text = preg_replace('~[^-\w]+~', '', $text);

  if( $unique_id !== null ) {
    $text .= "-".$unique_id;
  }

  if( $old_locale !== null ) {
    setlocale( LC_CTYPE, $old_locale );
  }
  return $text;
}