微信公众号实现扫码获取微信用户信息（网页授权）

$url ="http://www.baidu.com";
$level=3;
$size=4;
Vendor('phpqrcode.phpqrcode'); //引入插件
$errorCorrectionLevel = intval($level) ;//容错级别
$matrixPointSize = intval($size);//生成图片大小
//生成二维码图片
$object = new \QRcode(); 
$path = "Public/ER/1.png"; //本地文件存储路径
$object->png($url, $path, $errorCorrectionLevel, $matrixPointSize, 2);

$tid = 0; //传值的参数
$level=3;
$size=4;
Vendor('phpqrcode.phpqrcode');
$errorCorrectionLevel = intval($level) ;//容错级别
$matrixPointSize = intval($size);//生成图片大小
//生成二维码图片
$object = new \QRcode();
$path = "Public/ER/" . $tid . ".png"; //本地文件存储路径
$object->png($url, $path, $errorCorrectionLevel, $matrixPointSize, 2);
$appid='******'; //公众号唯一标识
$redirect_uri = urlencode ( 'http://www.****.net/index.php/Admin/Sindex/getUserInfo?id='.$tid ); //这个是设置参数和授权后重定向的回调链接地址
//snsapi_userinfo弹出授权页面，可通过openid拿到昵称、性别、所在地 snsapi_base ，不弹出授权页面，直接跳转，只能获取用户openid　
$url ="https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect"; 

function getJson($url){
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); 
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 $output = curl_exec($ch);
 curl_close($ch);
 return json_decode($output, true);
}

public function getUserInfo()
{
 $appid = "*****"; //公众号唯一标识
 $secret = "*****"; //应用秘钥
 //$code是回调的时候地址上带的 只需要get方式接收就可以了
 $code = $_GET["code"]; 
 //获取传过来的值
 $htjid = $_GET["id"];
 //第一步:取得openid
 $oauth2Url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
 $oauth2 = $this->getJson($oauth2Url);
 //第二步:根据全局access_token和openid查询用户信息 
 $access_token = $oauth2["access_token"]; 
 $openid = $oauth2['openid']; 
 $get_user_info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
 $userinfo = $this->getJson($get_user_info_url);
 //写入数据库微信用户
 M()->startTrans();//开启事务
 $n = M("zp_user"); //写入的表
 $openid = $data['openid'] = $userinfo['openid']; //微信用户openid
 $data['sex'] = $userinfo['sex']; //性别 
 $data['headimgurl'] = $userinfo['headimgurl']; //头像
 $data['province'] = $userinfo['province']; //地区sheng
 $data['city'] = $userinfo['city']; //地区shi
 $data['subscribe_time'] = time(); //时间
 $data['qr_scene'] = $htjid; //传过的值
 $data['nickname'] = $userinfo['nickname']; //昵称
 $z = $n->lock(true)->add($data);
 if(!$z)
 {
 M()->rollback();//回滚
 $this->error('添加错误!');
 }else{
 M()->commit();//事务提交
 }
}