微信網頁授權獲取用戶 OpenID 完整流程

View 型選單無法直接取得 OpenID，需結合「網頁授權獲取用戶基本資訊」介面。

步驟 1：配置授權回調域名（如 www.example.com）

步驟 2：導向授權頁面

<?php
session_start();
if (isset($_SESSION['user'])) { print_r($_SESSION['user']); exit; }
$APPID = '您的AppID';
$REDIRECT_URI = 'https://www.example.com/callback.php';
$scope = 'snsapi_base'; // 不彈窗授權，僅獲取 openid
$state = 'STATE';
$url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=$APPID&redirect_uri=".urlencode($REDIRECT_URI)."&response_type=code&scope=$scope&state=$state#wechat_redirect";
header("Location: $url");
?>

步驟 3：回調頁面換取 access_token 與用戶資訊

<?php
$appid = '您的AppID'; $secret = '您的AppSecret';
$code = $_GET["code"];
$tokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
$ch = curl_init($tokenUrl); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $res = curl_exec($ch); curl_close($ch);
$json = json_decode($res, true);
$access_token = $json['access_token']; $openid = $json['openid'];
// 獲取用戶詳細資訊
$userUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
$ch = curl_init($userUrl); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $res = curl_exec($ch); curl_close($ch);
$user = json_decode($res, true);
$_SESSION['user'] = $user; print_r($user);
?>