微信网页授权登录（非公众号第三方平台）

之前做的微信登录因为传错了一个代码，只能在公众号里面登录，不能在订阅号或者联系人的链接里面登录。 经过仔细研究，阅读文档，才发现这个原因。

这些代码可以出现授权页

$appid = 'xxxxxxxxxxxxxxxxx';
$redirect_uri   = urlencode('http://www.xxx.com/xxx.php?act=xxxx');
$url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.$appid.'&redirect_uri='.$redirect_uri.'&response_type=code&scope=snsapi_userinfo&state='.rand().'&connect_redirect=1#wechat_redirect';
header('location:'.$url);

这些代码可以获取到用户信息

//获取微信用户详情
function wxapi_get_user_info($appid,$response_type,$code)
{
    //第二步：通过code获取access_token
    $code = empty($_GET['code']) ? '' : trim($_GET['code']);
    if(!empty($code))
    {
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$response_type&code=$code&grant_type=authorization_code";
        $result = https_request($url);
        $jsoninfo = json_decode($result, true);

        //print_r($jsoninfo);
        if(!empty($jsoninfo["access_token"]) && !empty($jsoninfo["openid"]) ) {
            $access_token = $jsoninfo["access_token"];
            $openid = $jsoninfo["openid"];
        }else{
            echo '页面链接失效，请重新操作';
            die(); 
        }
        //echo '<br>'.$access_token ;

        //检验授权凭证（access_token）是否有效
        $url2 = "https://api.weixin.qq.com/sns/auth?access_token=$access_token&openid=$openid";
        $result2= https_request($url2);
        $jsoninfo2 = json_decode($result2, true);
        //print_r($jsoninfo2);

        if($jsoninfo2['errmsg'] == 'ok')
        {
            //获取用户个人信息（UnionID机制）
            $url3 = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid";
            $result3= https_request($url3);
            $jsoninfo3 = json_decode($result3, true);
            //echo '<pre>';
            //print_r($jsoninfo3);
            return $jsoninfo3;
        }
    }
}


if (!function_exists('https_request')) {
    function https_request($url, $data = null){
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }
}