$redirect_uri="http://你的微信开放平台绑定域名下处理扫码事件的方法";
$redirect_uri=urlencode($redirect_uri);//该回调需要url编码
$appID="你的appid";
$scope="snsapi_login";//写死，微信暂时只支持这个值
//准备向微信发请求
$url = "https://open.weixin.qq.com/connect/qrconnect?appid=" . $appID."&redirect_uri=".$redirect_uri."&response_type=code&scope=".$scope."&state=STATE#wechat_redirect";
//请求返回的结果(实际上是个html的字符串)
$result = file_get_contents($url);
//替换图片的src才能显示二维码
$result = str_replace("/connect/qrcode/", "https://open.weixin.qq.com/connect/qrcode/", $result);
return $result; //返回页面

 <script src="http://res.wx.qq.com/connect/zh_CN/htmledition/js/wxLogin.js"></script>

<div id="login_container"></div>

$(document).ready(function()
{var obj = new WxLogin({id:"login_container",//div的idappid: "你的appid",scope: "snsapi_login",//写死redirect_uri:encodeURI("你的处理扫码事件的方法") ,state: "",style: "black",//二维码黑白风格        href: "https://某个域名下的css文件"});
});

//回调
public function codeinfo()
{$code = $_GET["code"];$appid = "你的appid";$secret = "你的secret";if (!empty($code))  //有code
        {//通过code获得 access_token + openid$url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $appid. "&secret=" . $secret . "&code=" . $code . "&grant_type=authorization_code";$jsonResult = file_get_contents($url);$resultArray = json_decode($jsonResult, true);$access_token = $resultArray["access_token"];$openid = $resultArray["openid"];//通过access_token + openid 获得用户所有信息,结果全部存储在$infoArray里,后面再写自己的代码逻辑$infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" . $access_token . "&openid=" . $openid;$infoResult = file_get_contents($infoUrl);$infoArray = json_decode($infoResult, true);

　　　　 } }