PHP微信网页授权获取openid和获取用户信息

头一次接触微信认证和curl，摸了两三天才找到点门路，先把代码贴上来，以备不时之需

入口函数是getOpenid
先新建一个index.php，代码如下

<?php

include('./wechat.php');

    $wechat = new Wechat();
    //获取openid和accessToken
    $wechat->getOpenid();
    //获取用户信息
    //$wechat->getUserInfo();

然后在和index.php同级的目录新建一个wechat.php
在这个文件里你要改一个地址，看仔细！

<?php
/**
 * 微信公众号获取openid
 */
class Wechat
{
    private $redirect_url = "https://note.coccoo.cc/PHP/61.html";//这里填你自己的地址！！要能访问到这个类下的getOpenid方法！！

    //用户同意授权，获取openid
    //应用授权作用域，snsapi_base （不弹出授权页面，直接跳转，只能获取用户openid）,  snsapi_userinfo （弹出授权页面，可通过openid拿到昵称、性别、所在地。）
    public function getOpenid($scope = 'snsapi_base'){
        if (!isset($_GET['code'])){
            $url = $this->get_authorize_url($scope);
            Header("Location: $url");
            exit();
        }else{
            //获取code码用以获取openid
            $code = $_GET['code'];
            $res = $this->get_token($code);
            return $res;//完整数据
            //return $res['openid'];
        }
    }

    /**
     * 拼接url
     */
    public function get_authorize_url($scope){
        $appid='xxxxxxxxxxx';//微信公众号appid
        $state='123';//状态码
        //处理回调域名
        $redirect_url = $this->redirect_url;
        $redirect_url = urlencode($redirect_url);    //对中文转码
        //拼接url
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?";
        $url = $url . 'appid='.$appid;
        $url = $url . '&redirect_uri='.$redirect_url;
        $url = $url . '&response_type=code';
        $url = $url . "&scope=" . $scope;     //应用授权作用域，snsapi_base （不弹出授权页面，直接跳转，只能获取用户openid），snsapi_userinfo （弹出授权页面，可通过openid拿到昵称、性别、所在地。
        $url = $url . "&state=" . $state;
        return $url;
    }

    /**
     * 通过code换取openid/token
     */
    public function get_token($code = ''){
        $appid='xxxxxxxxxxxxxx';//微信公众号appid
        $secret='xxxxxxxxx';//应用密钥

        $wx_access_url= 'https://api.weixin.qq.com/sns/oauth2/access_token?';
        $wx_access_url = $wx_access_url . 'appid='.$appid;
        $wx_access_url = $wx_access_url . '&secret='.$secret;
        $wx_access_url = $wx_access_url . '&code='.$code;
        $wx_access_url = $wx_access_url . '&grant_type=authorization_code';

        $res = $this->http($wx_access_url);    //发送网络请求
        if ($res[0] == 200){
            $arr = json_decode($res[1],true);   //返回数组
            return $arr;
        }
        return $res[1];
    }

     /**
     * 微信获取用户信息
     */
    public function getUserInfo(){
        $data = $this->getOpenid('snsapi_userinfo');//获取用户信息
        $access_token = $data['access_token'];
        $openId = $data['openid'];

        $infourl = 'https://api.weixin.qq.com/sns/userinfo?';
        $infourl = $infourl . 'access_token='.$access_token;
        $infourl = $infourl . '&openid='.$openId;
        $infourl = $infourl . '&lang=zh_CN';
        $info = $this->http($infourl);  //用户信息数据
        if($info[0] == 200){
            return json_decode($info[1],true);//返回包含信息的数组
        }
        return $info[1];
    }

    //发送网络请求
    public function http($url, $method='', $postfields = null, $headers = array(), $debug = false)
    {
        $ci = curl_init();
        /* Curl settings */
        curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
        curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 30);
        curl_setopt($ci, CURLOPT_TIMEOUT, 30);
        curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);
        //没有这下面一句，可能报错“SSL certificate problem: unable to get local issuer certificate”
        //但是这一句是跳过验证，所以安全敏感度不高的可以用这个方法
        curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, 0);

        switch ($method) {
            case 'POST':
                curl_setopt($ci, CURLOPT_POST, true);
                if (!empty($postfields)) {
                    curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
                    $this->postdata = $postfields;
                }
                break;
        }
        curl_setopt($ci, CURLOPT_URL, $url);
        curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ci, CURLINFO_HEADER_OUT, true);
        $response = curl_exec($ci);
        $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);

        if ($debug) {
            echo "=====post data======\r\n";
            var_dump($postfields);

            echo '=====info=====' . "\r\n";
            print_r(curl_getinfo($ci));

            echo '=====$response=====' . "\r\n";
            print_r($response);
        }
        curl_close($ci);
        return array($http_code, $response);
    }
}

然后在微信浏览器访问你的index.php就可以了。