【微信】根据appid, secret, code获取用户基本信息

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;
}