原生php 实现微信授权登录

不依赖任何框架，原生php 实现微信授权登录：
 
只需要两个文件：
 

index.php

weixin.class.php

 
index.php代码如下：

<?phpsession_start();if($_SESSION['openid']){		exit('已经授权登录过了。。。');	} {		include_once "weixin.class.php";		$wx_login = new Wxlogin();		$userinfo = $wx_login->getUserInfo();				if($userinfo['openid']){						$_SESSION['openid'] =  $userinfo['openid'];						var_dump($userinfo);					} else {			exit('授权失败');		}}

weixin.clsss.php 代码如下（自行替换当中 app_id 和 app_key 和 授权回调地址）：

<?phpclass Wxlogin{	    //private $login_page_url = "https://open.weixin.qq.com/connect/qrconnect?";//微信登录界面    private $login_page_url = "https://open.weixin.qq.com/connect/oauth2/authorize?";//微信登录界面    private $get_accessToken_url = "https://api.weixin.qq.com/sns/oauth2/access_token?";//后去token的url    //private $get_openId_url = 'https://graph.qq.com/oauth2.0/me';//获取openid的url    private $get_user_info = "https://api.weixin.qq.com/sns/userinfo?";//获取用户信息的url    private $app_id = '';    private $app_key = '';    public $redirect_url = '';	private $access_token;    //QQ登录页面    private function get_wx_login_page()    {        $state = md5(rand(1,1000));        $query = [            'appid' => $this->app_id,            'redirect_uri' => $this->redirect_url,            'response_type' => 'code',            'scope' => 'snsapi_userinfo',            'state' => $state,        ];        $_SESSION['state'] = $state;//保存state验证                $url= $this->login_page_url.http_build_query($query).'#wechat_redirect';                header("Location:$url");        exit;    }        //获取access_token    private function get_code()    {        //获取code        @$code = $_GET['code'];        if(!$code){            $this->get_wx_login_page();        }        $state = $_GET['state'];		/*        if($state != $_SESSION['state']){            echo "state is wrong!";            exit;        }		*/        $_SESSION['state'] = null;        $query = [            'grant_type' => 'authorization_code',            'code'       => $code,            'secret' => $this->app_key,            'appid' => $this->app_id,        ];        return $this->get_curl($this->get_accessToken_url, http_build_query($query));        }        //获取token    private function get_token_info()    {        //获取access_token        /* {            "access_token":"ACCESS_TOKEN",            "expires_in":7200,            "refresh_token":"REFRESH_TOKEN",            "openid":"OPENID",            "scope":"SCOPE"        } */        $data = json_decode($this->get_code(),true);        //参数组装数组                        $this->access_token = $data["access_token"];                $array = array(            'access_token' => $data["access_token"],            'openid'       => $data['openid'],        );                return $this->get_curl($this->get_user_info, http_build_query($array));    }        //获取openid&&获取用户信息    public function getUserInfo()    {        $data = $this->get_token_info();                        $data = json_decode($data, true);        $data['access_token'] = $this->access_token;        return $data;    }        //curl GET请求    private function get_curl($url,$query)    {        $url_request = $url.$query;        $curl = curl_init();            //设置抓取的url        curl_setopt($curl, CURLOPT_URL, $url_request);        //设置头文件的信息作为数据流输出        curl_setopt($curl, CURLOPT_HEADER, 0);        //设置获取的信息以文件流的形式返回,而不是直接输出.        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);        //执行命令        $data = curl_exec($curl);        //关闭URL请求        curl_close($curl);        return $data;        }}