pbootcms对接微信扫码登录代码核心片段和步骤（前后端）

<!-- 引入jquery库 -->
<script src="http://cdn.bootcss.com/jquery/3.5.1/jquery.min.js"></script>

<!-- 生成二维码的canvas -->
<div id="qrcode"></div>

<!-- 用于轮询检查扫码状态 -->
<div id="check_login"></div>

<script>
$(function(){
    // 生成二维码
    var url = "http://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";
    url = url.replace("APPID", "你的AppID");
    url = url.replace("REDIRECT_URI", encodeURIComponent("http://你的域名/wechat_callback.php"));
    $('#qrcode').qrcode({width: 200,height: 200,text: url});

    // 轮询检查扫码状态
    setInterval(function(){
        $.ajax({
            url: "http://你的域名/check_login.php",
            dataType: "json",
            success: function(data){
                if(data.code == 0){
                    alert("登录成功！");
                    window.location.reload();
                }
            }
        });
    }, 3000);
});
</script>

<?php

// 获取微信授权码
$code = $_GET['code'];

// 获取access_token和openid
$url = "http://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=".urlencode($code)."&grant_type=authorization_code";
$url = str_replace("APPID", "你的AppID", $url);
$url = str_replace("APPSECRET", "你的AppSecret", $url);
$json = file_get_contents($url);
$data = json_decode($json, true);
$access_token = $data['access_token'];
$openid = $data['openid'];

// 将access_token和openid存储在session中
session_start();
$_SESSION['access_token'] = $access_token;
$_SESSION['openid'] = $openid;

// 跳转回原页面
header('Location: http://你的域名/wechat_login.html');

<?php

// 获取session中的access_token和openid
session_start();
$access_token = $_SESSION['access_token'];
$openid = $_SESSION['openid'];

// 检查access_token和openid是否存在
if(empty($access_token) || empty($openid)){
    echo json_encode(array('code' => -1, 'msg' => '未登录'));
    exit();
}

// 检查用户是否已经扫码并确认登录
$url = "http://api.weixin.qq.com/sns/auth?access_token=".urlencode($access_token)."&openid=".urlencode($openid);
$json = file_get_contents($url);
$data = json_decode($json, true);
if($data['errcode'] == 0){
    echo json_encode(array('code' => 0, 'msg' => '已登录'));
    exit();
} else {
    echo json_encode(array('code' => 1, 'msg' => '未确认登录'));
    exit();
}