public function isWechat()
{
if ($this->isRequired(['msg_signature', 'timestamp', 'nonce'], $_GET)) {
extract($_GET);
if (empty($_GET['echostr'])) {
} else {
// 第一次绑定
$echostr = urldecode($echostr);
$ary = [$this->Token, $timestamp, $nonce, $echostr];
sort($ary, SORT_STRING);
if ($msg_signature == sha1(implode($ary))) {
die(CryptStatic::decrypt($echostr, $this->CorpID, $this->EncodingAESKey));
}
}
}
}
/**
* 对正常消息进行加密
* @param string $xml
* @return SimpleXMLElement
*/
protected function crypt_generate($xml)
{
return CryptStatic::encrypt($xml, $this->appid, $this->encodingAesKey);
}