Pop\Crypt\Mcrypt::__construct PHP Method

    public function __construct($cipher = null, $mode = null, $source = null)
    {
        if (!function_exists('mcrypt_encrypt')) {
            throw new Exception('Error: The mcrypt extension is not installed.');
        }
        $this->setCipher($cipher);
        $this->setMode($mode);
        $this->setSource($source);
    }