网页编程网

微信网页授权是服务号才有的高级功能，开发者可以通过授权后获取用户的基本信息；在此之前，想要获取消息信息只能在用户和公众号交互时根据openid获取用户信息；而微信网页授权可在不需要消息交互，也不需要关注的情况下获取用户的基本信息。

微信网页授权时通过OAuth2.0完成的，整个过程分为三步：

用户授权，获取code；

根据code获取access_token【可通过refresh_token刷新获取较长有效期】；

通过access_token和openid获取用户信息。

<?php
/**
 * 微信授权相关接口
 * 
 */
class Wechat {
    //高级功能-》开发者模式-》获取
    private $app_id = 'xxx';
    private $app_secret = 'xxxxxxx';
    /**
     * 获取微信授权链接
     * 
     * @param string $redirect_uri 跳转地址
     * @param mixed $state 参数
     */
    public function get_authorize_url($redirect_uri = '', $state = ''){
        $redirect_uri = urlencode($redirect_uri);
        return "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->app_id}&redirect_uri={$redirect_uri}&response_type=code&scope=snsapi_userinfo&state={$state}#wechat_redirect";
    }
    
    /**
     * 获取授权token
     * 
     * @param string $code 通过get_authorize_url获取到的code
     */
    public function get_access_token($app_id = '', $app_secret = '', $code = ''){
        $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->app_id}&secret={$this->app_secret}&code={$code}&grant_type=authorization_code";
        $token_data = $this->http($token_url);
        
        if($token_data[0] == 200){
            return json_decode($token_data[1], TRUE);
        }
        return FALSE;
    }
    /**
     * 获取授权后的微信用户信息
     * 
     * @param string $access_token
     * @param string $open_id
     */
    public function get_user_info($access_token = '', $open_id = '') {
        if($access_token && $open_id){
            $info_url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$open_id}&lang=zh_CN";
            $info_data = $this->http($info_url);
            if($info_data[0] == 200){
                return json_decode($info_data[1], TRUE);
            }
        } 
        return FALSE;
    }
    
    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);
 
        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);
    }
}