php获取微信openid

使用微信接口，无论是自动登录还是微信支付我们首先需要获取的就是openid,获取openid的方式有两种，一种是在关注的时候进行获取，这种订阅号就可以获取的到，第二种是通过网页授权获取，这种获取需要的是认证服务号。

今天我要说的是第二种网页授权获取openid。下面是我写的一个关于获取openid的类

<?php
/**
 * 微信授权相关接口
 * 
 * @link http://HdhCmsTestphpddt测试数据
 */
class Wchat
{
 private $app_id = 'wx444444444444';
 private $app_secret = '77777777';
private $state='aaaa';
   /**
* 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测试数据/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['code'])){
  //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['code'];
  $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 = '')
    {
 $appid=$this->app_id;
 $appsecret=$this->app_secret;
 
   $token_url = "https://api.weixin.qq测试数据/sns/oauth2/access_token?appid=".$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='', $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);
    }
 
}
?> 

getOpenid($turl)这个方法就是获取openid的方法。前端调用代码如下：

 $openid=isset($_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);    

 }
 
  } 

以上就是我总结的获取openid的方法啦。

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