获取密文后，经sha1之后与获取的signature相比较，偶尔相等，大多数不相等，为什么？ public function decryptMsg($msgSignature, $timestamp, $nonce, $postData, &$msg) { if (strlen($this->encodingAesKey) != 43) { return ErrorCode::$IllegalAesKey; } $pc = new Prpcrypt(); $pc->Prpcrypt($this->encodingAesKey); //提取密文 $xmlparse = new XMLParse; $array = $xmlparse->extract($postData); $ret = $array[0]; if ($ret != 0) { return $ret; } if ($timestamp == null) { $timestamp = time(); } $encrypt = $array[1]; $touser_name = $array[2]; $arr = [$this->token, $timestamp, $nonce,$encrypt]; sort($arr); $signature = sha1(implode($arr)); //此处$signature与$msgSignature经常不相等，为什么 if ($signature != $msgSignature) { return ErrorCode::$ValidateSignatureError; } $result = $pc->decrypt($encrypt, $this->appId); if ($result[0] != 0) { return $result[0]; } $msg = $result[1]; return ErrorCode::$OK; }