原作者称：QQ的账号登录及api操作，使用oauth 2.0。官方提供的sdk都太过庞大，这是我自己简化的，提供简单的账号登录、获取个人信息、发布分享等功能，如果需要其他功能可以根据官方的api文档自行添加。

callback.php

<?php
//授权回调页面，即配置文件中的$callback_url
session_start();
require_once('config.php');
require_once('qq.php');

if(isset($_GET['code']) && trim($_GET['code'])!=''){
	$qq=new qqPHP($qq_k, $qq_s);
	$result=$qq->access_token($callback_url, $_GET['code']);
}
if(isset($result['access_token']) && $result['access_token']!=''){
	echo '授权完成，请记录<br/>access token：<input size="50" value="',$result['access_token'],'">';

	//保存登录信息，此示例中使用session保存
	$_SESSION['qq_t']=$result['access_token']; //access token
}else{
	echo '授权失败';
}
echo '<br/><a href="./">返回</a>';
?>

config.php

<?php
//配置文件
header('Content-Type: text/html; charset=UTF-8');

$qq_k=''; //QQ应用APP ID
$qq_s=''; //QQ应用APP KEY
$callback_url='http://yoururl/callback.php'; //授权回调网址
$scope='get_user_info,add_share'; //权限列表，具体权限请查看官方的api文档
?>

index.php

<?php
// 转载自：http://www.oschina.net/code/snippet_930167_19888 （ QQ的账号登录及api操作 2013年04月03日 ）
// 

session_start();
require_once('config.php');
require_once('qq.php');

$qq_t=isset($_SESSION['qq_t'])?$_SESSION['qq_t']:'';

//检查是否已登录
if($qq_t!=''){
	$qq=new qqPHP($qq_k, $qq_s, $qq_t);
	$qq_oid=$qq->get_openid();
	$openid=$qq_oid['openid']; //获取登录用户open id

	//获取登录用户信息
	$result=$qq->get_user_info($openid);
	var_dump($result);

	/**
	//发布分享
	$title='开源中国'; //分享页面标题
	$url='http://www.oschina.net/'; //分享页面网址
	$site=''; //QQ应用名称
	$fromurl='';  //QQ应用网址
	$result=$qq->add_share($openid, $title, $url, $site, $fromurl);
	var_dump($result);
	**/

}else{
	//生成登录链接
	$qq=new qqPHP($qq_k, $qq_s);
	$login_url=$qq->login_url($callback_url, $scope);
	echo '<a href="',$login_url,'">点击进入授权页面</a>';
}
?>

qq.php

<?php
/**
 * PHP Library for qq.com
 *
 * @author PiscDong (http://www.piscdong.com/)
 */
class qqPHP
{
	function __construct($appid, $appkey, $access_token=NULL){
		$this->appid=$appid;
		$this->appkey=$appkey;
		$this->access_token=$access_token;
	}

	function login_url($callback_url, $scope=''){
		$params=array(
			'client_id'=>$this->appid,
			'redirect_uri'=>$callback_url,
			'response_type'=>'code',
			'scope'=>$scope
		);
		return 'https://graph.qq.com/oauth2.0/authorize?'.http_build_query($params);
	}

	function access_token($callback_url, $code){
		$params=array(
			'grant_type'=>'authorization_code',
			'client_id'=>$this->appid,
			'client_secret'=>$this->appkey,
			'code'=>$code,
			'state'=>'',
			'redirect_uri'=>$callback_url
		);
		$url='https://graph.qq.com/oauth2.0/token?'.http_build_query($params);
		$result_str=$this->http($url);
		$json_r=array();
		if($result_str!='')parse_str($result_str, $json_r);
		return $json_r;
	}

	/**
	function access_token_refresh($refresh_token){
	}
	**/

	function get_openid(){
		$params=array(
			'access_token'=>$this->access_token
		);
		$url='https://graph.qq.com/oauth2.0/me?'.http_build_query($params);
		$result_str=$this->http($url);
		$json_r=array();
		if($result_str!=''){
			preg_match('/callback\(\s+(.*?)\s+\)/i', $result_str, $result_a);
			$json_r=json_decode($result_a[1], true);
		}
		return $json_r;
	}

	function get_user_info($openid){
		$params=array(
			'openid'=>$openid
		);
		$url='https://graph.qq.com/user/get_user_info';
		return $this->api($url, $params);
	}

	function add_share($openid, $title, $url, $site, $fromurl, $images='', $summary=''){
		$params=array(
			'openid'=>$openid,
			'title'=>$title,
			'url'=>$url,
			'site'=>$site,
			'fromurl'=>$fromurl,
			'images'=>$images,
			'summary'=>$summary
		);
		$url='https://graph.qq.com/share/add_share';
		return $this->api($url, $params, 'POST');
	}

	function api($url, $params, $method='GET'){
		$params['access_token']=$this->access_token;
		$params['oauth_consumer_key']=$this->appid;
		$params['format']='json';
		if($method=='GET'){
			$result_str=$this->http($url.'?'.http_build_query($params));
		}else{
			$result_str=$this->http($url, http_build_query($params), 'POST');
		}
		$result=array();
		if($result_str!='')$result=json_decode($result_str, true);
		return $result;
	}

	function http($url, $postfields='', $method='GET', $headers=array()){
		$ci=curl_init();
		curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, FALSE); 
		curl_setopt($ci, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 30);
		curl_setopt($ci, CURLOPT_TIMEOUT, 30);
		if($method=='POST'){
			curl_setopt($ci, CURLOPT_POST, TRUE);
			if($postfields!='')curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
		}
		$headers[]="User-Agent: qqPHP(piscdong.com)";
		curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ci, CURLOPT_URL, $url);
		$response=curl_exec($ci);
		curl_close($ci);
		return $response;
	}
}