public function encrypt($str)

    {

        //$str = "hh";

        $key = "key:123";//密钥

        $cipher = MCRYPT_DES;

        $models = MCRYPT_MODE_ECB;

        $iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher,$models),MCRYPT_RAND);

        //加密

        $str_encrypt = mcrypt_encrypt($cipher,$key,$str,$models,$iv);

        return $str_encrypt;

    }

    public function decrypt($str_encrypt)

    {

        $key = "key:123";//密钥

        $cipher = MCRYPT_DES;

        $models = MCRYPT_MODE_ECB;

        $iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher,$models),MCRYPT_RAND);

        $str_decrpt = mcrypt_decrypt($cipher,$key,$str_encrypt,$models,$iv);

        return $str_decrpt;

    }