php微信公众平台验证微信服务器(TOKEN验证)

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class IndexController extends Controller
{

    // 公众号验证
    public  function index(Request $request){

        // file_put_contents('./storage/1.log','请求'. "\r\n", FILE_APPEND);
        $echoStr = $_GET["echostr"];//从微信用户端获取一个随机字符赋予变量echostr
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }

    }

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

        $token = "4LVC8G4qW3gc7laLDe5p";
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

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