<?php  
class Oauth
{
    private $appID = \'xxxxxxx\';
    private $appsecret = \'xxxxxxxxxxxxxxxxxxxxxxxx\';

    private $code;
    private $token;
    private $openid;

    //授权地址，未授权会跳转到这个路径进行授权（power方法的访问路径）
    private $power_url = \'http://www.wx.com/Oauth.php?method=power\';
    //授权成功回调地址，授权成功后会跳转到这个路径获取用户信息（getUser方法的访问路径）
    private $redirect_uri = \'http://www.wx.com/Oauth.php?method=getUser\';
    //授权日志目录
    private $log_filedir = "./logs/oauth/";

    //获取用户信息
    function getUser() {
        //判断用户session是否存在，存在直接返回[省略]

        //没有用户session则去授权获取
        $this->code = $_GET[\'code\'];
        $token = $this->getToken();
        if($token[\'code\']){
            header(\'location:\' . $this->power_url);//跳转到授权页面
        }
        $url = \'https://api.weixin.qq.com/sns/userinfo?access_token=\'.$this->token.\'&openid=\'.$this->openid.\'&lang=zh_CN\';
        $user = $this->send($url);
        $this->_log(\'获取用户信息：\' . $this->ajax($user));
        if(!isset($user[\'openid\'])) {
            $this->_log(\'获取用户信息失败！\');
            return "获取信息失败，请重新进入";
        }

        //入库存session，将openid作为唯一标识[省略]

        //返回用户信息
        return $this->ajax($user);
    }

    //获取token
    public function getToken() {
        $url = \'https://api.weixin.qq.com/sns/oauth2/access_token?appid=\'.$this->appID.\'&secret=\'.$this->appsecret.\'&code=\'.$this->code.\'&grant_type=authorization_code\';
        $token = $this->send($url);
        $this->_log(\'获取access_token：\' . $this->ajax($token));
        if(isset($token[\'access_token\'])) {
            $this->token = $token[\'access_token\'];
            $this->openid = $token[\'openid\'];
            return [\'code\'=>0, \'msg\'=>\'获取access_token成功\'];
        }else{
            return [\'code\'=>1, \'msg\'=>\'获取access_token失败\'];
        }
    }

    //网页授权
    function power() {
        //请求授权
        header(\'location:https://open.weixin.qq.com/connect/oauth2/authorize?appid=\'.$this->appID.\'&redirect_uri=\'.$this->redirect_uri.\'&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect\');
    }

    /**
    * @param $url
    * @param null $_input
    * @param string $data_type
    * @return mixed
    * $_input= ["post"=>[],"refer"=>"",cookiefile=\'\']
    */
    function send($url, $input=null, $data_type=\'json\') {
        $ch = curl_init();
        $useragent = isset($input[\'useragent\']) ? $input[\'useragent\'] : \'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2\';
        curl_setopt( $ch, CURLOPT_URL, $url );
        curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
        curl_setopt( $ch, CURLOPT_AUTOREFERER, true );
        curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );
        curl_setopt( $ch, CURLOPT_POST, isset($input[\'post\']) );
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //不验证证书
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); //不验证证书
        if( isset($input[\'post\']) ) curl_setopt( $ch, CURLOPT_POSTFIELDS, $input[\'post\'] );
        if( isset($input[\'refer\']) ) curl_setopt( $ch, CURLOPT_REFERER, $input[\'refer\'] );
        curl_setopt( $ch, CURLOPT_USERAGENT, $useragent );
        curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, ( isset($input[\'timeout\']) ? $input[\'timeout\'] : 5 ) );
        $result = curl_exec( $ch );
        curl_close( $ch );
        if ($data_type == \'json\') {
            $result = json_decode($result,true);
        }
        return $result;
    }

    //日志记录
    private function _log($log_content){
        !is_dir($this->log_filedir) && mkdir($this->log_filedir, 0755, true);//目录不存在则创建目录
        $log_filename = $this->log_filedir . date("Ymd") . \'.log\';//日志文件路径

        file_put_contents($log_filename, \'[\'.date("H:i:s").\']\' .PHP_EOL . $log_content . PHP_EOL."------------------------ --------------------------".PHP_EOL, FILE_APPEND);
    }

    function ajax($data)
    {
        return json_encode($data, JSON_UNESCAPED_UNICODE);
    }

}

$oauth = new Oauth();
$method = isset($_GET[\'method\'])?$_GET[\'method\']:\'getUser\';
echo $oauth->$method();