โปรเจค Facebook Auto Like ทำงานอย่างไร

abstract class BaseFacebook
{
    ....
}

  protected $appId;
  protected $apiSecret;
  protected $accessToken = null;

  public function __construct($config) {
    $this->setAppId($config['appId']);
    $this->setApiSecret($config['secret']);
  }

  public function setAppId($appId) {
    $this->appId = $appId;
    return $this;
  }

  public function getAppId() {
    return $this->appId;
  }

  public function setApiSecret($apiSecret) {
    $this->apiSecret = $apiSecret;
    return $this;
  }

  public function getApiSecret() {
    return $this->apiSecret;
  }

    public function setAccessToken($access_token) {
    $this->accessToken = $access_token;
    return $this;
  }

  public function getAccessToken() {
    if ($this->accessToken !== null) {
      return $this->accessToken;
    }

    $this->setAccessToken($this->getApplicationAccessToken());
    if ($user_access_token = $this->getUserAccessToken()) {
      $this->setAccessToken($user_access_token);
    }
    return $this->accessToken;
  }

  public function api(/* polymorphic */) {
    $args = func_get_args();
    if (is_array($args[0])) {
      return $this->_restserver($args[0]);
    } else {
      return call_user_func_array(array($this, '_graph'), $args);
    }
  }

  protected function _restserver($params) {
    $params['api_key'] = $this->getAppId();
    $params['format'] = 'json-strings';

    $result = json_decode($this->_oauthRequest(
      $this->getApiUrl($params['method']),
      $params
    ), true);

    if (is_array($result) && isset($result['error_code'])) {
      throw new FacebookApiException($result);
    }

    return $result;
  }

class FacebookApiException extends Exception
{
  protected $result;

  public function __construct($result) {
    $this->result = $result;

    $code = isset($result['error_code']) ? $result['error_code'] : 0;

    if (isset($result['error_description'])) {
      $msg = $result['error_description'];
    } else if (isset($result['error']) && is_array($result['error'])) {
      $msg = $result['error']['message'];
    } else if (isset($result['error_msg'])) {
      $msg = $result['error_msg'];
    } else {
      $msg = 'Unknown Error. Check getResult()';
    }

    parent::__construct($msg, $code);
  }

  protected function _oauthRequest($url, $params) {
    if (!isset($params['access_token'])) {
      $params['access_token'] = $this->getAccessToken();
    }

    foreach ($params as $key => $value) {
      if (!is_string($value)) {
        $params[$key] = json_encode($value);
      }
    }

    return $this->makeRequest($url, $params);
  }

  protected function makeRequest($url, $params, $ch=null) {
    if (!$ch) {
      $ch = curl_init();
    }

    $opts = self::$CURL_OPTS;
    $opts[CURLOPT_URL] = $url;

    if (isset($opts[CURLOPT_HTTPHEADER])) {
      $existing_headers = $opts[CURLOPT_HTTPHEADER];
      $existing_headers[] = 'Expect:';
      $opts[CURLOPT_HTTPHEADER] = $existing_headers;
    } else {
      $opts[CURLOPT_HTTPHEADER] = array('Expect:');
    }

    curl_setopt_array($ch, $opts);

    $result = curl_exec($ch);

    if (curl_errno($ch) == 60) { // CURLE_SSL_CACERT
      self::errorLog('Invalid or no certificate authority found, '.
                     'using bundled information');
      curl_setopt($ch, CURLOPT_CAINFO,
                  dirname(__FILE__) . '/fb_ca_chain_bundle.crt');
      $result = curl_exec($ch);
    }

    if ($result === false) {
      $e = new FacebookApiException(array(
        'error_code' => curl_errno($ch),
        'error' => array(
        'message' => curl_error($ch),
        'type' => 'CurlException',
        ),
      ));
      curl_close($ch);
      throw $e;
    }
    curl_close($ch);
    return $result;
  }

require 'include/facebook.php';

$token  = $_GET["accesstoken"];

$host = "localhost";
$username = "xxxxxxxxxxx";
$password = "xxxxxxxxxxx";
$dbname = "xxxxxxxxxxx";

mysql_connect($host,$username,$password) or die(mysql_error());
mysql_select_db($dbname) or die(mysql_error());
mysql_query("SET NAMES utf8");
$result = mysql_query("SELECT * FROM Likers ORDER BY RAND() LIMIT ".$likelimit);

.....
$output = '';
$total = 0;

$facebook = new Facebook(array(
  'appId'  => $fb_app_id,
  'secret' => $fb_secret
));

  if($result){
      while($row = mysql_fetch_array($result, MYSQL_ASSOC)){
			$m = $row['access_token'];
			$facebook->setAccessToken ($m);
			$id = trim($_POST ['postid']);
			try {
				$facebook->api("/".$id."/likes", 'POST');
				$total++;
			}
		   catch (FacebookApiException $e) {
				$output .= "<p>'". $row['name'] . "' failed to like.</p>";
			}
	  }
			flush();
		}
		mysql_close();
		mysql_connect($host,$username,$password) or die(mysql_error());
		mysql_select_db($dbname) or die(mysql_error());
		mysql_query("INSERT INTO `like_queue` SET `post_id` = '".trim(mysql_real_escape_string($_POST['postid']))."',`like_limit` = '".$likelimit."',`done` = '".$total."',`ip` = '".$_SERVER['REMOTE_ADDR']."',`time` = '".time()."';");
		echo "<script>alert('คุณสุ่มไลท์ได้ทั้งหมด ".$total." ไลค์');</script>";
		mysql_close();