微信token验证失败

//不验证，输出即可，微信平台和服务器握手

ob_clean();//核心就是这句 大概作用就是清除前面的输出缓冲区
echo  $_GET["echostr"];
exit;
           

//验证这样写

class Check{

public $token="";//这里自己写自己配置的token

//接收参数并验证
public function check()
{      
    $echoStr = $_GET["echostr"];
    if($this->checkSignature()){
        ob_clean();
        echo $echoStr;
        exit;
    }
}


private function checkSignature()
{
    $signature = $_GET["signature"];
    $timestamp = $_GET["timestamp"];
    $nonce = $_GET["nonce"]; 

    $token = $this->token;
    $tmpArr = array($token, $timestamp, $nonce);
    sort($tmpArr);
    $tmpStr = implode( $tmpArr );
    $tmpStr = sha1( $tmpStr );

    if( $tmpStr == $signature ){
        return true;
    }else{
        return false;
    }
}
           

}