my facebook api graph OAUTH class

This is a rough example of how a good php class could be developed for the facebook API. I started this a while ago, and just touched it up before publishing it now…

class facebook {
	var $api_key;
	var $user_id;
	var $string;

	function __construct(){
		$this->call_url='https://graph.facebook.com/' ;
		$this->debug=false;
	}

	public function set_debug(){ //override to debug
		$this->debug=true;
	}

	private function inner_debug ($data,$function) {
		//used to easily display all the data from a
		//returned request from this class
		//so a user can visualize what data they have
		if($this->debug == true){ //outputs the array for testing
			echo 'START: function <b>'.$function.'</b> data <br>';
			echo 'key => item <br>';
			foreach ($data as $key => $item){
				echo $key .' => ' . $item . '<br>';
			}
			echo 'END: function <b>'.$function.'</b> data <br><br>';
		}

	} 

	function set_data($access_token,$user_id=null){
		$this->access_token = $access_token;

		if(!is_null($user_id)){
			$this->user_id = $user_id;
		}else{
			$this->user_id = null;
		}

		$this->call_with_token = true;
	}

	private function get_facebook_data($string){
		//this will just retreive the data

		//see if url is formatted properly at end!

		if($this->call_with_token == true){
			//if we have a valid access token, than we can tag it on
			$string = $string . '?access_token=' . $this->access_token;
		}

		if($this->debug == true){
			echo '<b>facebook graph string</b>: '. $string . '<br><br>';
		}

		$content=file_get_contents($string);
		$json=json_decode($content,true);
		return $json;
	}

	/***********************************************
	FUNCTIONS TO WORK WITH FACEBOOK
	***********************************************/
	//gets users basic profile information
	function get_user($user_id){
		//fields from: http://developers.facebook.com/docs/reference/api/user

		//build string
		$string=$this->call_url . $user_id;

		//get data
		$data=$this->get_facebook_data($string);

		$this->inner_debug ($data,'get_user');

		return $data;
	}

	function get_user_statuses($user_id){
		//this will get the most recent user status update
		$string=$this->call_url . $user_id . '/statuses';

		//get data
		$data=$this->get_facebook_data($string);

		return $data;
	}

	//publishes to the users stream
	function stream_publish($publish_to,$message,$picture=null,$link=null,$name=null,$caption=null,$description=null,$source=null,$actions=null,$privacy=null,$targeting=null){
		//http://developers.facebook.com/docs/reference/api/post
		//NOTE: its down a ways on the page where it says "publishing"
		if($this->call_with_token != true){
			//we do not have a access token
			echo 'Facebook Class Error - no OAUTH access token, set_data function must be set!<br>';
			exit;
		}

		$publish['access_token'] = $this->access_token;

		if(!is_null($message))
			$publish['message'] = $message;
		if(!is_null($picture))
			$publish['picture'] = $picture;
		if(!is_null($link))
			$publish['link'] = $link;
		if(!is_null($name))
			$publish['name'] = $name;
		if(!is_null($caption))
			$publish['caption'] = $caption;
		if(!is_null($description))
			$publish['description'] = $description;
		if(!is_null($source))
			$publish['source'] = $source;
		if(!is_null($actions))
			$publish['actions'] = $actions;
		if(!is_null($privacy))
			$publish['privacy'] = $privacy;
		if(!is_null($targeting))
			$publish['targeting'] = $targeting;

		if($this->debug == true){
			foreach($publish as $key => $out){
				echo 'PUBLISH'.$key .' -'.$out .'<br>';
			}
		}

		$url=$this->call_url . $publish_to . '/feed';

		$ch = curl_init();
		curl_setopt_array($ch, array(
			CURLOPT_URL => $url,
			CURLOPT_POSTFIELDS => http_build_query($publish),
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_VERBOSE => true
			));

		$result = curl_exec($ch);
		curl_close($ch);

		$json=json_decode($result,true);
		return $json['id']; //return the id of the post
	}

	/*********************************************
	-----------specific functions-------------
	to do small simple tasks but wrapped in
	a simple function instead of having to call
	the specific part of the array
	*******************************************/

	//gets the fan count of a page
	function get_fan_count($page_id){
		$array=$this->get_user($page_id);
		return $array['likes'];
	}

	//get the last status update of a page
	function get_last_status_update($page_id){
		$array=$this->get_user_statuses($page_id);
		return $array['data'][0]['message'];
	}
}

A few usage examples:

$facebook = new facebook;
//$facebook->set_debug(); //will output data during build

$access_token='VALID OAUTH TOKEN';
//$facebook->set_data($access_token,'211700141'); //set oauth token, profile id

$result = $facebook->stream_publish('211700141','test message');  //this will publish to your facebook stauts, if you have a valid token and put in your profile id
echo "PUBLISH RESULT ".$result;

$data = $facebook->get_user('211700141'); //gets as much info as possible about a user id, and loads it into data array

echo $data['name']; //example of outputting "John Klingelhoets" which is my profile

echo $facebook->get_last_status_update('211700141'); //would output my last status update