public function friendlyURL($string, $replacement = '-') {
        $map = array(
            '/à|á|?|a|?/' => 'a',
            '/è|é|ê|?|?/' => 'e',
            '/ì|í|?/' => 'i',
            '/ò|ó|?|?/' => 'o',
            '/ù|ú|?|?/' => 'u',
            '/?|?/' => 'c',
            '/?|ň/' => 'n',
            '/?/' => 'l',
            '/y/' => 'y',
            '/?/' => 't',
            '/?/' => 'z',
            '/?/' => 's',
            '/?/' => 'ae',
            '/?/' => 'oe',
            '/ü/' => 'ue',
            '/?/' => 'Ae',
            '/ü/' => 'Ue',
            '/?/' => 'Oe',
            '/?/' => 'ss',
            '/ /'=>' ',
            '/　/'=>'',
            '/～|·|！|@|#|￥|%|…|&|×|（|）|-|+|=|『|【|』|】|、|:|；|“|”|’|《|，|》|。|？|/|—|_|‘|：|√|＜|°|丶/'=>' ',
            '/[^ws?-?]/' => ' ',
            '/\s+/' => $replacement
        );
 
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\s+/',$replacement, strtolower($string));
        $string = trim($string,$replacement);
        return $string;
    }