php获取微信openid方法总结

Ester ·

更新时间:2024-11-10

· 856 次阅读

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://www.phpddt.com
 */
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.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['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;
    $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$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='', $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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