以上为微信官方的文档，想要实现微信退款通知处理业务，使用的thinkphp3.2

通过对上述完成

使用php 无论如何对都req_info 无法解密

求大神指导 ，或提供一个dmeo

const CIPHER = MCRYPT_RIJNDAEL_256;

const MCRYPT_MODE = MCRYPT_MODE_ECB;

$tools = new \WxPayNotify();

$xml = $GLOBALS['HTTP_RAW_POST_DATA'];//获取xml回调数据

$array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);//转换xml数据为数组

// $data = json_decode('{"return_code":"SUCCESS","appid":"wxa88a657b659971cd","mch_id":"1290531301","nonce_str":"c88807107134237f13d7d6e6cdd1b3a1","req_info":"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"}',true);

// $data = $tools->handle($array_data);

$wxpay = C('payment.wxpay');

//指定初始化向量iv的大小：

$encryptData = base64_decode($array_data['req_info']);

$decryptedData = $this->_decryptAesData($encryptData);

/**

* decrypt data

* @param string $encryptData

* @param string $md5LowerKey

* @return array

*/

private function _decryptAesData( $encryptData, $md5LowerKey = '')

{

if (empty($md5LowerKey)) {

$wxpay = C('payment.wxpay');

$md5LowerKey = strtolower(md5($wxpay['APPID']));

}

// var_dump($wxpay);

$iv = mcrypt_create_iv(mcrypt_get_iv_size(self::CIPHER, self::MCRYPT_MODE), MCRYPT_RAND);

$decrypted = mcrypt_decrypt(self::CIPHER, $md5LowerKey, $encryptData, self::MCRYPT_MODE, $iv);

return $this->xml2array($decrypted);

}

/**

* reply to wechat

* @param $xml

*/

public function replyNotify($xml)

{

if (is_array($xml)) {

$xml = $this->toXml($xml);

}

echo $xml;

}

/**

* @param string $xml

* @return array

* @throws \Exception

*/

public function xml2array( $xml)

{

if (empty($xml)) {

throw new \Exception('Error xml data!');

}

$p = xml_parser_create();

xml_parse_into_struct($p, $xml, $values, $index);

xml_parser_free($p);

$result = [];

foreach ($values as $val) {

$result[strtolower($val['tag'])] = $val['value'];

}

return $result;

}