Method substr

lib/php/lib/StringFunc/Core.php:33–41

* @param string $str * @param int $start * @param int|null $length * @return false|string */

($str, $start, $length = null)

     * @return false|string
     */
    public function substr($str, $start, $length = null)
    {
        // specifying a null $length would return an empty string
        if ($length === null) {
            return substr((string) $str, $start);
        }

        return substr((string) $str, $start, $length);
    }

    /**
     * @param string $str