public static function create($lenght)
    {
        $characters = 'abcdefghijk01234lmnopq56789rstuxyvwz';
        $charLenght = strlen($characters);

        $string = '';
        for ($i = 0; $i < $lenght; $i++) {
            $index = mt_rand(0, $charLenght - 1);
            $string .= $characters[$index];
        }

        return $string;
    }