豆瓣的账号登录及api操作

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

	function login_url($callback_url, $scope=''){
		$params=array(
			'response_type'=>'code',
			'client_id'=>$this->client_id,
			'redirect_uri'=>$callback_url,
			'scope'=>$scope,
			'state'=>md5(time())
		);
		return 'https://www.douban.com/service/auth2/auth?'.http_build_query($params);
	}

	function access_token($callback_url, $code){
		$params=array(
			'grant_type'=>'authorization_code',
			'code'=>$code,
			'client_id'=>$this->client_id,
			'client_secret'=>$this->client_secret,
			'redirect_uri'=>$callback_url
		);
		$url='https://www.douban.com/service/auth2/token';
		return $this->http($url, http_build_query($params), 'POST');
	}

	function access_token_refresh($callback_url, $refresh_token){
		$params=array(
			'grant_type'=>'refresh_token',
			'refresh_token'=>$refresh_token,
			'client_id'=>$this->client_id,
			'client_secret'=>$this->client_secret,
			'redirect_uri'=>$callback_url
		);
		$url='https://www.douban.com/service/auth2/token';
		return $this->http($url, http_build_query($params), 'POST');
	}

	function me(){
		$params=array();
		$url='https://api.douban.com/v2/user/~me';
		return $this->api($url, $params);
	}

	function share($text, $title, $url, $description='', $pic=''){
		$params=array(
			'text'=>$text,
			'rec_title'=>$title,
			'rec_url'=>$url,
			'rec_desc'=>$description,
			'rec_image'=>$pic
		);
		$url='https://api.douban.com/shuo/v2/statuses/';
		return $this->api($url, $params, 'POST');
	}

	function api($url, $params, $method='GET'){
		$headers[]="Authorization: Bearer ".$this->access_token;
		if($method=='GET'){
			$result=$this->http($url.'?'.http_build_query($params), '', 'GET', $headers);
		}else{
			$result=$this->http($url, http_build_query($params), 'POST', $headers);
		}
		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);
		}
		$headers[]="User-Agent: doubanPHP(piscdong.com)";
		curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ci, CURLOPT_URL, $url);
		$response=curl_exec($ci);
		curl_close($ci);
		$json_r=array();
		if($response!='')$json_r=json_decode($response, true);
		return $json_r;
	}
}