PHP微信扫码登录

<?php

class WeChatRcLogin
{
    public $state = '';
    public $appid = ''; 
    public $secret = '';
    public $redirect_uri = '';
    public $error = '';
    public $data = [];

    public function __construct($config)
    {
        
        $this->state = $config['state'];
        $this->appid = $config['appid'];
        $this->secret = $config['secret'];
        $this->redirect_uri = $config['redirect_uri'];
    }



    /**
     * 获取登录的url
     * @return string
     * @author: wmq
     * @Time: 2022/10/13 14:40
     */
    public function  getLoginUrl(){
        $arr = [
            'appid' => $this->appid, // appid
            'redirect_uri' => $this->redirect_uri, //回调url
            'response_type' => 'code',
            'scope' => 'snsapi_login',
            'state' => $this->state, //回调验签数据
        ];
        return 'https://open.weixin.qq.com/connect/qrconnect?'.http_build_query($arr).'#wechat_redirect';
    }

    /**
     * 获取access_token
     * @param $param
     * @return bool
     * @author: wmq
     * @Time: 2022/10/13 14:40
     */
    public function getAccessToken($param){
        if(!isset($param['code'],$param['state'])){
            $this->error = '缺少参数';
            return false;
        }
        $arr = [
            'appid' => $this->appid,
            'secret' => $this->secret,
            'code' => $param['code'],
            'grant_type' => 'authorization_code'
        ];
        $url = 'https://api.weixin.qq.com/sns/oauth2/access_token?'.http_build_query($arr);
        $result = Curl::get($url);
        if(isset($result['errcode'])){
            $this->error = $result['errmsg'];
            return false;
        }else{
            if($this->state && $param['state'] != $this->state){
                $this->error = '验签失败';
                return false;
            }
            $this->data = $result;
            return true;
        }
    }

    /**
     * 获取用户信息
     * @param $param
     * @return bool
     * @author: wmq
     * @Time: 2022/10/13 14:40
     */
    public function getUserInfo($param){
        
        if(!isset($param['access_token'],$param['openid'])){
            $this->error = '缺少参数';
            return false;
        }
        $arr = [
            'access_token' => $param['access_token'],
            'openid' => $param['openid'],
        ];
        $url = 'https://api.weixin.qq.com/sns/userinfo?'.http_build_query($arr);
        $result = Curl::get($url);
        if(isset($result['errcode'])){
            $this->error = $result['errmsg'];
            return false;
        }else{
            $this->data = $result;
            return true;
        }
    }
}

class Curl
{
    /**
     * curl post 请求
     * @param string $url 地址
     * @param array $data 数据
     * @return bool|string
     * @author: wmq
     * @Time: 2022/4/25 9:18
     */
    public static function post($url, $data = [],$header = []){
        return self::curl_request($url,$data,$header);

    }

    /**
     * get请求
     * @param string $url 地址
     * @param int $timeout 时间
     * @return bool|string
     * @author: wmq
     * @Time: 2022/4/25 9:21\
     */
    public static function get($url,$header = []){
        return self::curl_request($url,[],$header);
    }

    public static function curl_request($url,$data = [],$header)
    {
        !$header && $headerArray = ["Content-type:application/json;charset='utf-8'","Accept:application/json"];
        $header && $headerArray = $header;

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 30);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl,CURLOPT_HTTPHEADER,$headerArray);
        if (!empty($data)) {
            curl_setopt($curl, CURLOPT_POST, true);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        $output = curl_exec($curl);
        curl_close($curl);

        $res = json_decode($output,true);

        return $res;
    }
}












//使用方法
$config = [
    'appid' => '',  //appid 微信开放平台获取
    'secret' => '', // secret 微信开放平台获取
    'redirect_uri' => '', // 回调地址，微信开放平台设置，扫码成功后微信调到并携带code，state的地址
    'state' => '' // 回调签名验签 可以为空，可以存到缓存中验证
];

$arr = [];
$l = new WeChatRcLogin($config);

//获取跳转地址
// $l->getLoginUrl();


//https://developers.weixin.qq.com/doc/oplatform/Website_App/WeChat_Login/Authorized_Interface_Calling_UnionID.html

//access_token 建议根据expires_in 进行缓存 获取access_token 是有次数限制的，明细请看官网文档

//获取用户信息
if($l->getAccessToken($_GET)){  //获取access_token 根据state, code 微信回调会传过来，
    $data = $l->data; //access_token 信息
    if($l->getUserInfo($l->data)){ // 获取用户信息
        echo '获取成功<br>';
        $arr = array_merge($arr,$l->data);  //合并access_token 返回的东西 + 用户信息返回的东西
        var_dump($arr);
    }else{  //获取用户信息失败
        echo '获取用户信息失败<br>';
        var_dump($l->error);
    }
}else{
    echo '获取access_token失败<br>';
    var_dump($l->error);
    echo '<br>';
}