MYSQL fehler

<?php

namespace Revolution;
if(!defined('IN_INDEX')) { die('Sorry, you cannot access this file.'); }
class forms implements iForms
{

	public $error;

	final public function setData()
	{
		global $engine;
		foreach($_POST as $key => $value)
		{
			if($value != null)
			{
				$this->$key = $engine->secure($value);
			}
			else
			{
				$this->error = 'Please fill in all fields';
				return;
			}
		}

	}

	final public function unsetData()
	{
		global $template;
		foreach($this as $key => $value)
		{
			unset($this->$key);
		}
	}

	final public function writeData($key)
	{
		global $template;
		echo $this->$key;
	}

	final public function outputError()
	{
		global $template;
		if(isset($this->error))
		{
			echo "<div id='message'> " . $this->error . " </div>";
		}
	}

	/* Manage different pages */

	final public function getPageNews()
	{
		global $template, $engine;

			if(!isset($_GET['id']) || !is_numeric($_GET['id']))
			{
				$_GET['id'] = 1;
			}
				$result = mysql_query("SELECT title, id FROM cms_news WHERE id != '" . $engine->secure($_GET['id']) . "' ORDER BY id DESC");

				while($news1 = mysql_fetch_array($result))
				{
					$template->setParams('newsList', '&laquo; <a href="index.php?url=news&id='.$news1["id"].'">' . $news1['title'] . '</a><br/>');
				}

				$news = $engine->fetch_assoc("SELECT id, title, shortstory, longstory, author, published FROM cms_news WHERE id = '" . $engine->secure($_GET['id']) . "' LIMIT 1");
				$template->setParams('newsID', $news['id']);
				$template->setParams('newsTitle', $news['title']);
				$template->setParams('newsContent', $news['longstory']);
				$template->setParams('newsAuthor', $news['author']);
				$template->setParams('newsDate', date("d-m-y", $news['published']));

				unset($result);
				unset($news1);
				unset($news);
	}

	final public function getPageHome()
	{
		global $template, $engine;
		$a = 1;
		$data = mysql_query("SELECT title, id, published, shortstory, image FROM cms_news ORDER BY id DESC LIMIT 5");

        while($news = mysql_fetch_assoc ($data, MYSQL_ASSOC))
       	{
            $template->setParams('newsTitle-' . $a, $news['title']);
            $template->setParams('newsID-' . $a, $news['id']);
            $template->setParams('newsDate-' . $a, date("d-m-y", $news['published']));
            $template->setParams('newsCaption-' . $a, $news['shortstory']);
            $template->setParams('newsIMG-' . $a, $news['image']);
        	$a++;
        }

        unset($news);
        unset($data);
	}

}

?>