<?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);
 
  }
 
 
 
}
 
?>

$openid=isset($_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);  
 
        
 
     }
 
      
 
   }