1、根据公众号的appid获取code
    $APPID=APPID;//公众号在微信的appid
    $REDIRECT_URI='http://www.cacaabc.com/data.php';//回调页面    
    // $scope='snsapi_base';
    $scope='snsapi_userinfo';//需要授权
    $url="https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$APPID."&redirect_uri=".urlencode($REDIRECT_URI)."&response_type=code&scope=".$scope."&state=STATE#wechat_redirect";
    header("Location:".$url);

 //此处必须修改公众号的获取用户信息的回调url
 
2.data.php页面
$code = $_GET['code'];
$state = $_GET['state'];
 
/*根据code获取用户openid*/
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=secretid&code=".$code."&grant_type=authorization_code";
 
$abs = file_get_contents($url);
$obj=json_decode($abs);
$access_token = $obj->access_token;
$openid = $obj->openid;
/*根据code获取用户openid end*/
 
 
/*根据用户openid获取用户基本信息*/
$abs_url = "https://api.weixin.qq.com/sns/userinfo?access_token=".$access_token."&openid=".$openid."&lang=zh_CN";
$abs_url_data = file_get_contents($abs_url);
$obj_data=json_decode($abs_url_data);
echo $OpenId = $obj_data->openid;
 
echo $NickName = $obj_data->nickname;
/*根据用户openid获取用户基本信息*/ `在这里插入代码片`