接入微信支付、主动通知事件时，如果是PHP7.2+版本出现致命错误: “Call to undefined function mcrypt_module_open()”，官方并未针对做出更新。
修改class Prpcrypt类库下encrypt和decrypt两个方法，替换源码如下：
* 对明文进行加密
* @param string $text 需要加密的明文
* @return string 加密后的密文
public function encrypt($text, $appid)
try {
//获得16位随机字符串，填充到明文之前
$random = $this->getRandomStr();
$text = $random . pack("N", strlen($text)) . $text . $appid;
if (function_exists('mcrypt_module_open')) {
// 网络字节序
$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = substr($this->key, 0, 16);
//使用自定义的填充方式对明文进行补位填充
$pkc_encoder = new PKCS7Encoder;
$text = $pkc_encoder->encode($text);
mcrypt_generic_init($module, $this->key, $iv);
$encrypted = mcrypt_generic($module, $text);
mcrypt_generic_deinit($module);
mcrypt_module_close($module);
//print(base64_encode($encrypted));
//使用BASE64对加密后的字符串进行编码
return array(ErrorCode::$OK, base64_encode($encrypted));
} else if (function_exists('openssl_encrypt')) {
$iv = substr($this->key, 0, 16);
//使用自定义的填充方式对明文进行补位填充
$pkc_encoder = new PKCS7Encoder;
$text = $pkc_encoder->encode($text);
$encrypted = openssl_encrypt($text, 'AES-256-CBC', substr($this->key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
return array(ErrorCode::$OK, $encrypted);
} catch (Exception $e) {
//print $e;
return array(ErrorCode::$EncryptAESError, null);
* 对密文进行解密
* @param string $encrypted 需要解密的密文
* @return string 解密得到的明文
public function decrypt($encrypted, $appid)
if (function_exists('mcrypt_module_open')) {
try {
//使用BASE64对需要解密的字符串进行解码
$ciphertext_dec = base64_decode($encrypted);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = substr($this->key, 0, 16);
mcrypt_generic_init($module, $this->key, $iv);
$decrypted = mdecrypt_generic($module, $ciphertext_dec);
mcrypt_generic_deinit($module);
mcrypt_module_close($module);
} catch (Exception $e) {
return array(ErrorCode::$DecryptAESError, null);
} else if (function_exists('openssl_decrypt')) {
try {
$iv = substr($this->key, 0, 16);
$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', substr($this->key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
} catch (Exception $e) {
return array(ErrorCode::$DecryptAESError, null);
if ($decrypted === false) return [ErrorCode::$IllegalBuffer, null];
try {
//去除补位字符
$pkc_encoder = new PKCS7Encoder;
$result = $pkc_encoder->decode($decrypted);
//去除16位随机字符串,网络字节序和AppId
if (strlen($result) < 16)
return "";
$content = substr($result, 16, strlen($result));
$len_list = unpack("N", substr($content, 0, 4));
$xml_len = $len_list[1];
$xml_content = substr($content, 4, $xml_len);
$from_appid = substr($content, $xml_len + 4);
} catch (Exception $e) {
//print $e;
return array(ErrorCode::$IllegalBuffer, null);
if ($from_appid != $appid)
return array(ErrorCode::$ValidateAppidError, null);
return array(0, $xml_content);
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