Bytes PHP Framework Code

<?php
/**
* Handles the transactions related to Posts
*
* @author 		Dana Murad
* @file  		PostCT.php 
*
* @todo			
*/
require_once("../config/main.php");


class PostCT extends CT 
{
	//__________________________________ M E M B E R S _____________________________________  

	/**
	* @desc DAO
	* @var object
	*/
	private $DAO; 
	
	//__________________________________ C O N S T R U C T O R ____________________________ 
	
	/**
	* @desc Constructor
	*/
	function __construct
	(	
	)
	{	
		$this->DAO = new DAO(); 
		parent::__construct();					
	}
	
	//__________________________________ U T I L I T Y  __________________________________
	
	/**
	* @desc Gets a post object by its primary key
    * @access public
	* @param integer $id
	* @return object
	*/
    public function getPostByID
	(
	    $id
	)
    {
    	try 
    	{
    		$vo = new PostVO();
    		return $this->DAO->findByPK($vo,$id); 
    	}
    	catch (Exception $e)
    	{
    		Error::report($e);
    		return NULL;
    	}   
    }
    
    /**
    * @desc Adds a Post object to the database
    * @access public
    * @param resource $vo
    * @return string
    */
    public function add
	(
	    &$vo
	)
    {
    	try 
    	{
    		return $this->DAO->insert($vo);
    	}
    	catch (Exception $e)
    	{
    		Error::report($e);
    		return NULL;
    	}
    }
    
    /**
    * @desc Updates a Post object in the database. 
    * @access public
    * @param resource $vo
    * @return string 
    */
    public function update
	(
	    &$vo
	)
    {
    	try 
    	{
    		return $this->DAO->update($vo);
    	}
    	catch (Exception $e)
    	{
    		Error::report($e);
    		return NULL;
    	}
    }
    
    /**
    * @desc Delete a Post by its primary key. 
    * @access public
    * @param integer $id
    * @return string
    */
    public function delete
	(
	    $id
	)
    {
    	try 
    	{
    		$userVO = new PostVO($id);
    		return $this->DAO->delete($userVO);
    	}
    	catch (Exception $e)
    	{
    		Error::report($e);
    		return NULL;
    	}
    }
    
	/**
	* @desc Get the most recent post to a limit (default is ten)
	* @access public
	* @param integer $userID
	* @return array
	*/
	public function buildActivePosts
	(
		$userID
	)
	{
		try
		{	
			$postVO = new PostVO(); 
			$userID = mysql_real_escape_string($userID); 
						
			$voList = $this->DAO->findWhere($postVO,"`userID` = $userID","datePosted","DESC");
			
			return $voList;
		}
		catch(Exception $e)
		{
			Error::report($e);
		}
	}
    
	/**
	* @desc validates fields for POST
	* @access public
	* @param string $title
	* @param string $author
	* @param string $email
	* @param string $description
	* @return bool
	*/
	public function validateFields
	(
		$title,
		$author,
		$email,
		$description,
		$city,
		$state
	)
	{
		$noError = TRUE;
		
		if(empty($title))
		{
			$this->addMessage("Please provide a title for the book. ");
			$noError = FALSE; 
		}
		if(empty($author))
		{
			$this->addMessage("Please provide an author for this book, if no other type 'none'.");
			$noError = FALSE; 
		}
		if(!empty($email))
		{
			if(!checkEmailAddress($email))
			{
				$this->addMessage("Invalid email address given.");
				$noError = FALSE; 				
			}
		}
		if(empty($email) && empty($description))
		{
			$this->addMessage("Please provide an email address or some other contact information in the description field.");
			$noError = FALSE; 
		}

		if(empty($state))
		{
			$this->addMessage("Please a state.");
			$noError = FALSE; 
		}
		if(empty($city))
		{
			$this->addMessage("Please select the closest city.");
			$noError = FALSE; 
		}
		
		return $noError;
	}
		
		
}