PHP obtains the user's openid key code through the Code parameter of WeChat jump

The key code is as follows:

//获取微信登录用户信息
function getOpenID($appid,$appsecret,$code){
$url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=". 
$appsecret."&code=".$code."&grant_type=authorization_code";
$weixin=file_get_contents($url);//通过code换取网页授权access_token
$js //对JSON格式的字符串进行编码
$array = get_object_vars($jsondecode);//转换成数组
$openid = $array['openid'];//输出openid
return $openid;
}

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