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官网文档 https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/Access_Overview.html

php 示例代码

	public function index()
    {
        $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 ){
             echo $_GET['echostr']; //注意这一点 不是返回true
            exit;
        }else{
            echo false;
        }
    }