php 微信公众平台OAuth2.0网页授权，获取用户信息代码类封装demo

get_wx_data.php

<?php
/**
 * 获取微信用户信息
 * @author: Lucky hypo
 */
class GetWxData{
    private $appid = 'xxx';
    private $appsecret = 'xxxxxx';
    /**
     * 1、获取微信用户信息，判断有没有code，有使用code换取access_token，没有去获取code。
     * @return array 微信用户信息数组
     */
    public function get_user_all(){
        if (!isset($_GET['code'])){//没有code，去微信接口获取code码
            $callback = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];//微信服务器回调url，这里是本页url
            $this->get_code($callback);
        } else {//获取code后跳转回来到这里了
            $code = $_GET['code'];
            $data = $this->get_access_token($code);//获取网页授权access_token和用户openid
            $data_all = $this->get_user_info($data['access_token'],$data['openid']);//获取微信用户信息
            return $data_all;
        }
    }
    /**
     * 2、用户授权并获取code
     * @param string $callback 微信服务器回调链接url
     */
    private function get_code($callback){
        $appid = $this->appid;
        $scope = 'snsapi_userinfo';
        $state = md5(uniqid(rand(), TRUE));//唯一ID标识符绝对不会重复
        $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=' . $appid . '&redirect_uri=' . urlencode($callback) .  '&response_type=code&scope=' . $scope . '&state=' . $state . '#wechat_redirect';
        header("Location:$url");
    }
    /**
     * 3、使用code换取access_token
     * @param string 用于换取access_token的code，微信提供
     * @return array access_token和用户openid数组
     */
    private function get_access_token($code){
        $access_token_file = './access_token.txt';
        $get_data_status = false;
        $data = file_get_contents($access_token_file);
        if($data){
            $data = json_decode($data,true);
            $expire_time = isset($data['expire_time'])?$data['expire_time']:'0';
            if(time() > ($expire_time - 600)){
                $get_data_status = true;
            }
        }else{
            $get_data_status = true;
        }
        if($get_data_status == true){
            $appid = $this->appid;
            $appsecret = $this->appsecret;
            $url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $appid . '&secret=' . $appsecret . '&code=' . $code . '&grant_type=authorization_code';
            $user = json_decode(file_get_contents($url));
            if (isset($user->errcode)) {
                echo 'error:' . $user->errcode.'<hr>msg  :' . $user->errmsg;exit;
            }
            $data = json_decode(json_encode($user),true);//返回的json数组转换成array数组
            $data['expire_time'] = time()+$data['expires_in'];
            file_put_contents($access_token_file,json_encode($data));
        }

        return $data;
    }
    /**
     * 4、使用access_token获取用户信息
     * @param string access_token
     * @param string 用户的openid
     * @return array 用户信息数组
     */
    private function get_user_info($access_token,$openid){
        $url = 'https://api.weixin.qq.com/sns/userinfo?access_token=' . $access_token . '&openid=' . $openid . '&lang=zh_CN';
        $user = json_decode(file_get_contents($url));
        if (isset($user->errcode)) {
            echo 'error:' . $user->errcode.'<hr>msg  :' . $user->errmsg;exit;
        }
        $data = json_decode(json_encode($user),true);//返回的json数组转换成array数组
        return $data;
    }

    //对外开放，获取access_token
    public function get_access_token_open(){
        if (!isset($_GET['code'])){//没有code，去微信接口获取code码
            $protocol = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') || $_SERVER['SERVER_PORT'] == 443) ? "https://": "http://";
            //$callback = $protocol.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];//微信服务器回调url，这里是本页url
            $callback = $protocol.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];//微信服务器回调url，这里是本页url
            $this->get_code($callback);
        } else {//获取code后跳转回来到这里了
            $code = $_GET['code'];
            $data = $this->get_access_token($code);//获取网页授权access_token和用户openid
            return $data;
        }
    }
}

//使用方法：
$getWxData = new GetWxData();
if(isset($_GET['model']) && $_GET['model'] == 'get_access_token'){
    $data = $getWxData->get_access_token_open();
    echo(json_encode($data));exit();
}else{
    $data = $getWxData->get_user_all();
    echo '<pre>';
    print_r($data);
    exit();
}

//访问链接：
//http://127.0.0.1/get_wx_data.php
//http://127.0.0.1/get_wx_data.php?model=get_access_token
?>