微信小程序 消息推送php服务器验证实例详解

define("token","xxxxx");/ 后台填写的token
$wechatobj = new wechatapi();
$wechatobj->isvalid();
class wechatapi
{
public function isvalid()//验证微信接口，如果确认是微信就返回它传来的echostr参数
{
 $echostr = $_get["echostr"];
 if ($this->checksignature()) {
 echo $echostr;
 exit;
 }
}
private function checksignature() //官方的验证函数
{
 $signature = $_get["signature"];
 $timestamp = $_get["timestamp"];
 $nonce = $_get["nonce"];
 $token = token;
 $tmparr = array($token, $timestamp, $nonce);
 sort($tmparr, sort_string);
 $tmpstr = implode( $tmparr );
 $tmpstr = sha1( $tmpstr );
 if( $tmpstr == $signature ){
 return true;
 }else{
 return false;
 }
}
};