function getUserInfo(){
    $appid = "yourappid";  
    $secret = "yoursecret";  
    $code = $_GET["code"];  
    $get_token_url = ‘https://api.weixin.qq.com/sns/oauth2/access_token?appid=‘.$appid.‘&secret=‘.$secret.‘&code=‘.$code.‘&grant_type=authorization_code‘;  
      
    $ch = curl_init();  
    curl_setopt($ch,CURLOPT_URL,$get_token_url);  
    curl_setopt($ch,CURLOPT_HEADER,0);  
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );  
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);  
    $res = curl_exec($ch);  
    curl_close($ch);  
    $json_obj = json_decode($res,true);  
      
    //根据openid和access_token查询用户信息  
    $access_token = $json_obj[‘access_token‘];  
    $openid = $json_obj[‘openid‘];  
    $get_user_info_url = ‘https://api.weixin.qq.com/sns/userinfo?access_token=‘.$access_token.‘&openid=‘.$openid;  
      
    $ch = curl_init();  
    curl_setopt($ch,CURLOPT_URL,$get_user_info_url);  
    curl_setopt($ch,CURLOPT_HEADER,0);  
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );  
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);  
    $res = curl_exec($ch);  
    curl_close($ch);  
      
    //解析json  
    $user_obj = json_decode($res,true);  
    $_SESSION[‘user‘] = $user_obj;  
    //print_r($user_obj);
    return $user_obj;
}