thinkphp5接入微信登陆

1，公众平台配置回调域名，则通过微信访问域名会先跳转到微信 oauth2 接口，访问成功微信会返回一个用户code给回调地址

请求地址：$url ="https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&redirect_uri=".$redirect_uri."&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
2，根据返回的code获取access_token和用户唯一标识openid

请求地址：$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$secret."&code=".$code."&grant_type=authorization_code";

3，通过获取到的access_token 和 openid 即可获取到用户信息

请求地址：$urltoc = "https://api.weixin.qq.com/sns/userinfo?access_token=".$access_token."&openid=".$getopenid."&lang=zh_CN";

<?php namespace app\home\controller;
use think\Controller;
use think\Db;
use think\Session;
use think\Request;
 
class Index extends Controller{
     public function index(){
        // &#35775;&#38382;&#22495;&#21517;&#20250;&#20248;&#20808;&#25191;&#34892;index&#26041;&#27861;&#65292;&#29992;&#20197;&#33719;&#21462;&#21040;code
        $dbres = Db::name("setup")->find();
        $appid = $dbres['appid'];
        $redirect_uri = urlencode($dbres['back_url']);
        $url ="https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&amp;redirect_uri=".$redirect_uri."&amp;response_type=code&amp;scope=snsapi_userinfo&amp;state=STATE#wechat_redirect";
        header("Location:".$url);exit;
    }
 
    public function http_curl($url,$type='get',$res='json',$arr=''){
        //1.&#21021;&#22987;&#21270;curl
        $ch = curl_init();
        //2.&#35774;&#32622;curl&#30340;&#21442;&#25968;
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //&#19981;&#39564;&#35777;&#35777;&#20070;
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); //&#19981;&#39564;&#35777;&#35777;&#20070;
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        if ($type == 'post') {
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $arr);
        }
        //3.&#37319;&#38598;
        $output = curl_exec($ch);
        //4.&#20851;&#38381;
        curl_close($ch);
        if ($res == 'json') {
            return json_decode($output,true);
        }
    }
 
    public function getUserOpentId(){
        //&#22238;&#35843;&#22320;&#22336;&#20250;&#20256;&#22238;&#19968;&#20010;code&#65292;&#21017;&#25105;&#20204;&#26681;&#25454;code&#21435;&#33719;&#21462;openid&#21644;&#25480;&#26435;&#33719;&#21462;&#21040;&#30340;access_token
        $code = $_GET['code'];
        $dbres = Db::name("setup")-&gt;find();
        $appid = $dbres['appid'];
        $secret = $dbres['appsecret'];
 
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&amp;secret=".$secret."&amp;code=".$code."&amp;grant_type=authorization_code";
 
        $res = $this-&gt;http_curl($url);
        $access_token = $res['access_token'];
 
        $getopenid = $res['openid'];
        //&#33719;&#21462;&#29992;&#25143;&#25480;&#26435;&#20449;&#24687;
        $urltoc = "https://api.weixin.qq.com/sns/userinfo?access_token=".$access_token."&amp;openid=".$getopenid."&amp;lang=zh_CN";
        $resinfos = $this-&gt;http_curl($urltoc);
        $openid = $resinfos['openid'];
        $check_member = Db::name("member")-&gt;where('openid',$openid)-&gt;find();
        if(empty($check_member)){
            //&#39318;&#27425;&#36827;&#20837;&#65292;&#21017;&#33719;&#21462;&#29992;&#25143;&#20449;&#24687;&#65292;&#25554;&#20837;&#25968;&#25454;&#24211;
            $resinfo['openid'] = $openid;
            $insert_data = [
                'openid' =&gt; $openid,
                'create_time' =&gt; time()
            ];
            Db::name("member")-&gt;insert($insert_data);
            $userId = Db::name('member')-&gt;getLastInsID();
            Session::set('wx_member_info', $resinfo);
            $this-&gt;redirect('home/index/index_html');
        }else{
            //&#35828;&#26126;&#26159;&#24050;&#32463;&#26159;&#20844;&#20247;&#21495;&#25104;&#21592;&#65292;&#21017;&#35843;&#29992;&#29992;&#25143;&#20449;&#24687;&#23384;&#21040;session&#21363;&#21487;
            $wx_member_info = Db::name('member')-&gt;where("openid",$openid)-&gt;find();
            Session::set('wx_member_info', $wx_member_info);
            $this-&gt;redirect('home/index/index_html');
        }
    }
 
    public function index_html(){
        if(!Session::has("wx_member_info")){
            action("home/index/index");
        }else{
            return $this-&gt;fetch('index');
        }
    }
 
}