slugString

static function slugString($string, $replacement = '_')
  {
    $aux = preg_quote($replacement, '/');
 
    $map = array(
        '/à|á|ã|â/' = 'a',
        '/è|é|ê|ẽ|ë/' = 'e',
        '/ì|í|î/' = 'i',
        '/ò|ó|ô|õ|ø/' = 'o',
        '/ù|ú|ũ|û/' = 'u',
        '/ç/' = 'c',
        '/ñ/' = 'n',
        '/ä|æ/' = 'ae',
        '/ö/' = 'oe',
        '/ü/' = 'ue',
        '/Ä/' = 'Ae',
        '/Ü/' = 'Ue',
        '/Ö/' = 'Oe',
        '/ß/' = 'ss',
        '/[^\w\s]/' = ' ',
        '/\\s+/' = $replacement
    );
 
    return preg_replace(array_keys($map), array_values($map), $string);
  }