php gets WeChat openid

Using the WeChat interface, whether it is automatic login or WeChat payment, the first thing we need to obtain is the openid. There are two ways to obtain the openid. One is to obtain it when paying attention. This kind of subscription number can be obtained. The second is to obtain it through web page authorization, which requires an authentication service number.

What I want to talk about today is the second kind of web page authorization to obtain openid. The following is a class I wrote about getting openid

<?php
/**
 * 微信授权相关接口
 * 
 * @link http://www.phpddt.com
 */
class Wchat
{
      private $app_id = &#39;wx444444444444&#39;;
      private $app_secret = &#39;77777777&#39;;
     private $state=&#39;aaaa&#39;;
   /**
     * 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 = &#39;&#39;, $state = &#39;&#39;)
    {
        $redirect_uri = urlencode($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={$state}#wechat_redirect";
    }
     /**
     * 获取微信openid
     */
    public function getOpenid($turl)
    {
        if (!isset($_GET[&#39;code&#39;])){
            //触发微信返回code码
            
             $url=$this->get_authorize_url($turl, $this->state);
            
            Header("Location: $url");
            exit();
        } else {
            //获取code码，以获取openid
            $code = $_GET[&#39;code&#39;];
            $access_info = $this->get_access_token($code);
            return $access_info;
        }
        
    }
    /**
     * 获取授权token网页授权
     * 
     * @param string $code 通过get_authorize_url获取到的code
     */
    public function get_access_token($code = &#39;&#39;)
    {
      $appid=$this->app_id;
      $appsecret=$this->app_secret;
      
        $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$appsecret."&code=".$code."&grant_type=authorization_code";
        //echo $token_url;
        $token_data = $this->http($token_url);
       // var_dump( $token_data);
        if($token_data[0] == 200)
        {
            $ar=json_decode($token_data[1], TRUE);
            return $ar;
        }
        
        return $token_data[1];
    }
    
    
    public function http($url, $method=&#39;&#39;, $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 ($method) {
            case &#39;POST&#39;:
                curl_setopt($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 &#39;=====info=====&#39; . "\r\n";
            print_r(curl_getinfo($ci));
 
            echo &#39;=====$response=====&#39; . "\r\n";
            print_r($response);
        }
        curl_close($ci);
        return array($http_code, $response);
    }
 
}
?>

getOpenid($turl) This method is the method to get openid. The front-end calling code is as follows:

      $openid=isset($_COOKIE['openid'])?$_COOKIE['openid']:'';
        
            if(empty($openid))
            {
                $wchat=new wchat();
                $t_url='http://'.$_SERVER['HTTP_HOST'].'/user.php?act=register';
                
                $info=$wchat->getOpenid($t_url);
                
                if($info){
                     $openid=$info['openid'];
                  setcookie('openid',$openid,time()+86400*30);    
                    
                }
                
            }

The above is the method I summarized to obtain openid.

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