PHP7.2版本微信支付SDK中mcrypt_module_open() 方法报错解决方法

微信官方SDK在PHP7中提示：

mcrypt_module_open() is deprecated

mcrypt已被OPENSSL代替 具体修改如下

1、修改WXBizDataCrypt.php文件

public function decryptData( $encryptedData, $iv, &$data )
{
    if (strlen($this->sessionKey) != 24) {
        return ErrorCode::$IllegalAesKey;
    }
    $aesKey=base64_decode($this->sessionKey);
    
    if (strlen($iv) != 24) {
        return ErrorCode::$IllegalIv;
    }
    $aesIV=base64_decode($iv);
    // $aesCipher=base64_decode($encryptedData);
    $aesCipher=$encryptedData;
    $pc = new Prpcrypt($aesKey);
    $result = $pc->decrypt($aesCipher,$aesIV);
    var_dump($result);
    if ($result[0] != 0) {
        return $result[0];
    }
 
    $dataObj=json_decode( $result[1] );
    if( $dataObj  == NULL )
    {
        return ErrorCode::$IllegalBuffer.'--';
    }
    if( $dataObj->watermark->appid != $this->appid )
    {
        return ErrorCode::$IllegalBuffer.';;';
    }
    $data = $result[1];
    return ErrorCode::$OK;
}

2、修改PKCS7Encoder.php文件

public function decrypt( $aesCipher, $aesIV )
{
    try {
        // $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        
        // mcrypt_generic_init($module, $this->key, $aesIV);
        // //解密
        // $decrypted = mdecrypt_generic($module, $aesCipher);
        // mcrypt_generic_deinit($module);
        // mcrypt_module_close($module);
        $decrypted = openssl_decrypt($aesCipher,'AES-128-CBC',$this->key,OPENSSL_ZERO_PADDING,$aesIV);
        // var_dump($decrypted);
    } catch (Exception $e) {
        return array(ErrorCode::$IllegalBuffer, null);
    }
    try {
        //去除补位字符
        $pkc_encoder = new PKCS7Encoder;
        $result = $pkc_encoder->decode($decrypted);
    } catch (Exception $e) {
        //print $e;
        return array(ErrorCode::$IllegalBuffer, null);
    }
    return array(0, $result);
}