本帖内容较多，大部分都是源码，要修改的地方只有一个，其他只要复制过去，就可以完美运行。本帖主要针对CI框架，不用下载SDK，按我下面的步骤，建文件，复制代码就可以了。10分钟不要，接口就可完成。
第一步：申请APP ID，APP KEY，申请地址：http://connect.opensns.qq.com/
验证通过后：会得到APP ID,APP KEY。这是你用个文件把这些信息保持下来，免得用的时候有要上网去查，记录在本地记事本里，方便，用的时候打开就可以。如下：
APP ID：*******
APP KEY：******
回调地址：http://test.com

第二步：如果你的系统没有安装curl，请先安装curl。
怎么知道本地系统是否安装了curl呢，方法如下：
1.在web服务器目录（ Ubuntu下的通常为 /var/www )新建crul.PHP文件
2.编辑文件，键入下面一行代码：
<?php phpinfo(); ?>
3.保存文件
4.打开浏览器，浏览该网页。（例如：http://localhost/curl.php)
5.搜索"curl",如果没搜到就证明没安装curl。

下面是安装方法：
打开终端，输入下面的命令：
sudo apt-get install curl libcurl3 libcurl3-dev php5-curl
再重启apache：
sudo /etc/init.d/apache2 restart
这样curl就安装好了，打开你刚才的那个页面，搜一下curl,就可以看到了curl了，这表示已经安装成功，很简单吧。

如果还是没有，编辑你的php.ini文件,我的phpini.php文件在/etc/php5/apache2/php.ini,估计你的也差不多是在这个位置，去找找看，找到后，打开这个文件，在最后加上一行：
extension=curl.so

保存文件后重启Apache服务器，再打开页面，就会出现curl了。

第三步：代码
注：腾讯提供了SDK，可以在官网下载：下载地址：http://wiki.connect.qq.com/sdk%E4%B8%8B%E8%BD%BD，如果不是CI框架，估计下载下来就可以用了，CI框架调用规则不同，所以要做修改，如果是CI框架下开发QQ登录接口，就不用下载SDK了，用我下面的代码，下面正式上代码，完整的代码。

代码步骤：
1.打开application/config/constants.php文件
写入如下代码：
/*qq登陆*/
define('GET_AUTH_CODE_URL', "https://graph.qq.com/oauth2.0/authorize");
define('GET_ACCESS_TOKEN_URL' , "https://graph.qq.com/oauth2.0/token");
define('GET_OPENID_URL' , "https://graph.qq.com/oauth2.0/me");
保存

2.打开application文件夹，在application下新建一个文件夹isetting,在isetting下建一个qq_setting.php文件，
打开qq_setting.php文件，输入如下代码：

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**
* @qq互联配置信息
* 默认开启get_user_info模块
* **/

$config['inc_info'] = array(
array (
'appid' => '101091331',
'appkey' => '7cb032049f2c900fea509424e614a979',
'callback' => 'http://test.com'
),
array (
'get_user_info' => '1',
'add_topic' => '0',
'add_one_blog' => '0',
'add_album' => '0',
'upload_pic' => '0',
'list_album' => '0',
'add_share' => '0',
'check_page_fans' => '0',
'add_t' => '0',
'add_pic_t' => '0',
'del_t' => '0',
'get_repost_list' => '0',
'get_info' => '0',
'get_other_info' => '0',
'get_fanslist' => '0',
'get_idollist' => '0',
'add_idol' => '0',
'del_idol' => '0',
'get_tenpay_addr' => '0',
)
);
保存
说明：你需要把appid，appkey对应的键值修改成你刚刚申请的appid,appkey值，callback为回调地址（所谓回调地址就是登录成功后，返回到哪个页面），callback的值写你申请的时候做验证的那个地址。

3.打开application下的libraries文件，新建一个文件夹tencent，在tencent里面新建一个文件oauth.php,打开这个文件，复制下面的代码进去：

<?php

class Oauth
{
/**
* combineURL
* 拼接url
* @param string $baseURL 基于的url
* @param array $keysArr 参数列表数组
* @return string 返回拼接的url
*/

private $APIMap;

public function __construct() {
/*以下部分为获取第三方qq登陆资料*/
//初始化APIMap
/*
* 加#表示非必须，无则不传入url(url中不会出现该参数)， "key" => "val" 表示key如果没有定义则使用默认值val
* 规则 array( baseUrl, argListArr, method)
*/
$this->APIMap = array(


/* qzone */
"add_blog" => array(
"https://graph.qq.com/blog/add_one_blog",
array("title", "format" => "json", "content" => null),
"POST"
),
"add_topic" => array(
"https://graph.qq.com/shuoshuo/add_topic",
array("richtype","richval","con","#lbs_nm","#lbs_x","#lbs_y","format" => "json", "#third_source"),
"POST"
),
"get_user_info" => array(
"https://graph.qq.com/user/get_user_info",
array("format" => "json"),
"GET"
),
"add_one_blog" => array(
"https://graph.qq.com/blog/add_one_blog",
array("title", "content", "format" => "json"),
"GET"
),
"add_album" => array(
"https://graph.qq.com/photo/add_album",
array("albumname", "#albumdesc", "#priv", "format" => "json"),
"POST"
),
"upload_pic" => array(
"https://graph.qq.com/photo/upload_pic",
array("picture", "#photodesc", "#title", "#albumid", "#mobile", "#x", "#y", "#needfeed", "#successnum", "#picnum", "format" => "json"),
"POST"
),
"list_album" => array(
"https://graph.qq.com/photo/list_album",
array("format" => "json")
),
"add_share" => array(
"https://graph.qq.com/share/add_share",
array("title", "url", "#comment","#summary","#images","format" => "json","#type","#playurl","#nswb","site","fromurl"),
"POST"
),
"check_page_fans" => array(
"https://graph.qq.com/user/check_page_fans",
array("page_id" => "314416946","format" => "json")
),
/* wblog */

"add_t" => array(
"https://graph.qq.com/t/add_t",
array("format" => "json", "content","#clientip","#longitude","#compatibleflag"),
"POST"
),
"add_pic_t" => array(
"https://graph.qq.com/t/add_pic_t",
array("content", "pic", "format" => "json", "#clientip", "#longitude", "#latitude", "#syncflag", "#compatiblefalg"),
"POST"
),
"del_t" => array(
"https://graph.qq.com/t/del_t",
array("id", "format" => "json"),
"POST"
),
"get_repost_list" => array(
"https://graph.qq.com/t/get_repost_list",
array("flag", "rootid", "pageflag", "pagetime", "reqnum", "twitterid", "format" => "json")
),
"get_info" => array(
"https://graph.qq.com/user/get_info",
array("format" => "json")
),
"get_other_info" => array(
"https://graph.qq.com/user/get_other_info",
array("format" => "json", "#name", "fopenid")
),
"get_fanslist" => array(
"https://graph.qq.com/relation/get_fanslist",
array("format" => "json", "reqnum", "startindex", "#mode", "#install", "#sex")
),
"get_idollist" => array(
"https://graph.qq.com/relation/get_idollist",
array("format" => "json", "reqnum", "startindex", "#mode", "#install")
),
"add_idol" => array(
"https://graph.qq.com/relation/add_idol",
array("format" => "json", "#name-1", "#fopenids-1"),
"POST"
),
"del_idol" => array(
"https://graph.qq.com/relation/del_idol",
array("format" => "json", "#name-1", "#fopenid-1"),
"POST"
),
/* pay */

"get_tenpay_addr" => array(
"https://graph.qq.com/cft_info/get_tenpay_addr",
array("ver" => 1,"limit" => 5,"offset" => 0,"format" => "json")
)
);

}

//登陆
public function check_login()
{
if(isset($_SESSION['qq']['state']) && $_GET['state'] && ($_SESSION['qq']['state'] == $_GET['state']))
{
return 'true';
}
else
{
return 'false';
}
}

public function qq_login()
{
$CI = &get_instance();
$CI->config->load('isetting/qq_setting');
$setting = $CI->config->item('inc_info');
$appid = $setting[0]['appid'];
$callback = $setting[0]['callback'];
$scope = '';
foreach ($setting[1] as $key=>$val)
{
if($val === '1')
{
$scope .= $key . ',';
}
}
$scope = trim(rtrim($scope,','));

//-------生成唯一随机串防CSRF攻击
$state = md5(uniqid(rand(), TRUE));
$_SESSION['qq']['state'] = $state;

//-------构造请求参数列表
$keysArr = array(
"response_type" => "code",
"client_id" => $appid,
"redirect_uri" => $callback,
"state" => $state,
"scope" => $scope
);
$login_url = $this->combineURL(GET_AUTH_CODE_URL, $keysArr);
header("Location:$login_url");
}

//callback回调方法
public function qq_callback()
{
$CI = &get_instance();
$CI->config->load('isetting/qq_setting');
$setting = $CI->config->item('inc_info');
$state = $_SESSION['qq']['state'];
//--------验证state防止CSRF攻击
if($_GET['state'] != $state){
echo "<script>alert('QQ第三方登陆失败');</script>";
redirect('/login','location',301);
}

//-------请求参数列表
$keysArr = array(
"grant_type" => "authorization_code",
"client_id" => $setting[0]['appid'],
"redirect_uri" => $setting[0]['callback'],
"client_secret" => $setting[0]['appkey'],
"code" => $_GET['code']
);

//------构造请求access_token的url
$token_url = $this->combineURL(GET_ACCESS_TOKEN_URL, $keysArr);
$response = $this->get_contents($token_url);

$params = array();
parse_str($response, $params);

$_SESSION['qq']['access_token'] = $params["access_token"];

$access_token = $params["access_token"];
$openid= $this->get_openid();

//进入主页
//获取用户信息
$_data = $this->qq_get_user($access_token,$openid);

redirect('/','location',301);
}

//注销
public function qq_logout()
{

}


public function combineURL($baseURL,$keysArr){
$combined = $baseURL."?";
$valueArr = array();

foreach($keysArr as $key => $val){
$valueArr[] = "$key=$val";
}

$keyStr = implode("&",$valueArr);
$combined .= ($keyStr);

return $combined;
}

/**
* get_contents
* 服务器通过get请求获得内容
* @param string $url 请求的url,拼接后的
* @return string 请求返回的内容
*/
public function get_contents($url)
{
if (ini_get("allow_url_fopen") == "1") {
$response = file_get_contents($url);
}else{
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_URL, $url);
$response = curl_exec($ch);
curl_close($ch);
}

//-------请求为空
if(empty($response)){
echo "<script>alert('QQ第三方登陆失败');</script>";
redirect('/login','location',301);
}
return $response;
}

public function get_openid()
{

//-------请求参数列表
$keysArr = array(
"access_token" => $_SESSION['qq']['access_token']
);

$graph_url = $this->combineURL(GET_OPENID_URL, $keysArr);
$response = $this->get_contents($graph_url);

//----检测错误是否发生
if(strpos($response, "callback") !== false)
{

$lpos = strpos($response, "(");
$rpos = strrpos($response, ")");
$response = substr($response, $lpos + 1, $rpos - $lpos -1);
}

$user = json_decode($response);
//------记录openid
$_SESSION['qq']['openid'] = $user->openid;
return $user->openid;
}





/**
* _call
* 魔术方法，做api调用转发
* @param string $name 调用的方法名称
* @param array $arg 参数列表数组
* @since 5.0
* @return array 返加调用结果数组
*/
public function __call($name,$arg){
//如果APIMap不存在相应的api
if(empty($this->APIMap[$name])){
echo "<script>alert('获取资料出错');</script>";
redirect('/login','location',301);
}

//从APIMap获取api相应参数
$baseUrl = $this->APIMap[$name][0];
$argsList = $this->APIMap[$name][1];
$method = isset($this->APIMap[$name][2]) ? $this->APIMap[$name][2] : "GET";

if(empty($arg)){
$arg[0] = null;
}

//对于get_tenpay_addr，特殊处理，php json_decode对\xA312此类字符支持不好
if($name != "get_tenpay_addr"){
$response = json_decode($this->_applyAPI($arg[0], $argsList, $baseUrl, $method));
$responseArr = $this->objToArr($response);
}else{
$responseArr = $this->simple_json_parser($this->_applyAPI($arg[0], $argsList, $baseUrl, $method));
}

//检查返回ret判断api是否成功调用
if($responseArr['ret'] == 0){
return $responseArr;
}else{
echo "<script>alert('第三方登陆失败')</script>";
redirect('/','location',301);
}

}

//调用相应api
private function _applyAPI($arr, $argsList, $baseUrl, $method){
$pre = "#";
$keysArr = $this->keysArr;

$optionArgList = array();//一些多项选填参数必选一的情形
foreach($argsList as $key => $val){
$tmpKey = $key;
$tmpVal = $val;

if(!is_string($key)){
$tmpKey = $val;

if(strpos($val,$pre) === 0){
$tmpVal = $pre;
$tmpKey = substr($tmpKey,1);
if(preg_match("/-(\d$)/", $tmpKey, $res)){
$tmpKey = str_replace($res[0], "", $tmpKey);
$optionArgList[$res[1]][] = $tmpKey;
}
}else{
$tmpVal = null;
}
}

//-----如果没有设置相应的参数
if(!isset($arr[$tmpKey]) || $arr[$tmpKey] === ""){

if($tmpVal == $pre){//则使用默认的值
continue;
}else if($tmpVal){
$arr[$tmpKey] = $tmpVal;
}else{
if($v = $_FILES[$tmpKey]){

$filename = dirname($v['tmp_name'])."/".$v['name'];
move_uploaded_file($v['tmp_name'], $filename);
$arr[$tmpKey] = "@$filename";

}else{
$this->error->showError("api调用参数错误","未传入参数$tmpKey");
}
}
}

$keysArr[$tmpKey] = $arr[$tmpKey];
}
//检查选填参数必填一的情形
foreach($optionArgList as $val){
$n = 0;
foreach($val as $v){
if(in_array($v, array_keys($keysArr))){
$n ++;
}
}

if(! $n){
$str = implode(",",$val);
$this->error->showError("api调用参数错误",$str."必填一个");
}
}

if($method == "POST"){
if($baseUrl == "https://graph.qq.com/blog/add_one_blog") $response = $this->urlUtils->post($baseUrl, $keysArr, 1);
else $response = $this->urlUtils->post($baseUrl, $keysArr, 0);
}else if($method == "GET"){
$response = $this->urlUtils->get($baseUrl, $keysArr);
}

return $response;

}

//php 对象到数组转换
private function objToArr($obj){
if(!is_object($obj) && !is_array($obj)) {
return $obj;
}
$arr = array();
foreach($obj as $k => $v){
$arr[$k] = $this->objToArr($v);
}
return $arr;
}

//简单实现json到php数组转换功能
private function simple_json_parser($json){
$json = str_replace("{","",str_replace("}","", $json));
$jsonValue = explode(",", $json);
$arr = array();
foreach($jsonValue as $v){
$jValue = explode(":", $v);
$arr[str_replace('"',"", $jValue[0])] = (str_replace('"', "", $jValue[1]));
}
return $arr;
}

}

保存
说明：这段代码复制不过就行，不用做任何改动。这个是最核心的代码，代码比较多，但是功能代码就这些了，想想，在自己的网站上，别人用qq帐号就可以登录了，都不用注册，多方便啊，是吧，这样一想这些代码也不算多了。

4.建控制器。打开application下的controllers文件夹，在controllers下新建一个文件qq.php,打开qq.php,复制下面代码：

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/*
* @ qq登陆 注销 消息获取等
* @author
*/
class QQ extends CI_Controller
{

public function __construct() {
parent::__construct();
session_start();
$this->load->helper('url');
//error_reporting(0);
/*qq登陆*/
$this->load->library('tencent/oauth','oauth');
}

public function index()
{
//验证是登陆还是回调
if($this->oauth->check_login() === 'false')
{
$this->oauth->qq_login();
}
else
{
$this->oauth->qq_callback();
}

}
}

保存
说明：这段代码不用做修改。

5.放置登录按钮，点击用QQ帐号登录按钮，跳转到QQ登录页面登录。
在你的登录页面放按钮的位置，写入：
<div><a href="/qq"><img src="http://images.cnblogs.com/qq_login.png" width="110" /></a></div>

保存
说明：样式你可自己调整，图片按钮可以从官网下载，地址：http://wiki.connect.qq.com/%E8%A7%86%E8%A7%89%E7%B4%A0%E6%9D%90%E4%B8%8B%E8%BD%BD#2.QQ.E7.99.BB.E5.BD.95.E6.A1.86.E6.A0.87.E5.87.86.E6.A0.B7.E5.BC.8F

到这里，QQ第三方登录接口就OK了，你打开你的登录页面，点击QQ登录的图片按钮，它会转到QQ登录页面登录，如果要上线，要用到别的功能，可在这几个文件上填代码就行了。