<?php

/**
 * class/Product.class.php
 * define Product class
 * @param  string  $title   The title of the product
 * @param  string  $editor  The name's editor of the product
 * @param  float   $price   The price of the poduct
 * @author: Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright: 2008
 * @version 1
 */

// create a Product class
class Product
{

	// properties defined here
	protected $_title;
	protected $_editor;
	protected $_price;
	private $_errMsg;
	// end properties

	// class constructor
	public function __construct($title, $editor, $price)
	{
		// assign common properties to current product
 		$this->_title = $title;
 		$this->_editor = $editor;
 		$this->_price = $price;
	} // end constructor

	// methods defined here 
	public function getProductType()
	{
		// prevent non listed product type. could be grabbed within a database
		$typeTest = array('Book', 'Blue Ray', 'DVD', 'Magazine');
		if (in_array($this->_type, $typeTest)) {
 			return $this->_type;
 		} else {
	  		return $this->_errMsg = 'not a current product into the list';
		}
	}

	public function getProductTitle()
	{
		if (is_string($this->_title) && strlen($this->_title) > 0) {
	   		return $this->_title;
		} else {
 			return $this->_errMsg = '-no title available-';
 		}
	}
	
	public function getProductPrice()
	{
		return $this->_price;
	}

	public function getProductEditor()
	{
		if (is_string($this->_editor) && !empty($this->_editor)) {
			return $this->_editor;
		} else {
			return $this->_errMsg = '-no editor available-';
		}
	}
	// end methods

} // end class. no PHP end tag here to prevent crashing display


<?php

/**
 * class/Book.class.php
 * define Book child class and extends parent Product class
 * @param  string  $author     The author's name of the book
 * @param  int     $pageCount  The number of pages of the book
 * @author: Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright: 2008
 * @version 1
 */

// include parent class
@ include_once('class/Product.class.php');

// create a child class extended to parent Product class
class Book extends Product
{
	// properties defined here
	protected $_type = 'Book';
	protected $_author;
	protected $_pageCount;
	// end properties

	// methods defined here
	public function __construct($title, $editor, $author, $pageCount, $price)
	{
		// assign inheranced and individual properties to current extented object 
		parent::__construct($title, $editor, $price);
		$this->_author = $author;
		$this->_pageCount = $pageCount;
	} // end constructor

	// get function to display protected property
	public function getBookPageCount()
	{
		return $this->_pageCount;
	} // end PageCount
	// end methods

} // end class. no PHP end tag here to prevent crashing display


<?php

/**
 * class/Media.class.php
 * define Media child class
 * @param  string  $type      The type of the media must be one of the array list from Product.class.php
 * @param  string  $author    The author's name of the media
 * @param  int     $duration  The time lenght of the media
 * @author Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright 2008
 * @version 1
 */

// include parent class
@ include_once('class/Product.class.php');

// create a child class extended to parent Product class
class Media extends Product
{
	// properties defined here
	protected $_type;
	protected $_author;
	protected $_duration;

	//  methods defined here
	public function __construct($type, $title, $author, $editor, $duration, $price)
	{
		// assign inheranced and individual properties to current extented object
		parent::__construct($title, $editor, $price);
		$this->_type = $type;
		$this->_author = $author;
		$this->_duration = $duration;
	} // end constructor

	// get function to display protected property
	public function getMediaDuration()
	{
		return $this->_duration;
	} // end PageCount

} // end class. no PHP end tag here to prevent crashing display


<?php

/**
 * view/doctype.inc.php
 * return begin tags of an html document
 * @author: Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright: 2008
 * @version 1
 */

echo <<< TEMPLATE
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP OOP</title>
<!-- metas -->
<meta http-equiv="X-UA-Compatible" content="IE=7" />  <!-- prevent unexpected display before official IE 8 launch -->
<link rel="stylesheet" href="css/my-style.css" type="text/css" media="screen, projection" />
</head>
<body id="page">

TEMPLATE;
?>


<?php

/**
 * view/html_end.inc.php
 * return end tags of an html document
 * @author: Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright: 2008
 * @version 1
 */

echo <<< TEMPLATE
<script type="text/javascript" src="lib/js/my-script.js"></script>
</body>
</html>
TEMPLATE;
?>


<?php

/**
 * root/product_test.php
 * return results and constructs html page
 * @author: Patrick LEFEVRE (patrick[dot]lefevre[@]gmail.com)
 * @copyright: 2008
 * @version 1
 */
 
// include starting template
require_once('view/doctype.inc.php');

// include child class files
@ include_once('Book.class.php');
@ include_once('Media.class.php');

// create instances of objects. Note: Datas could be grabbed from a database in a real production context
$product1 = new Book('PHP OOP', 'PHP Team', '300', 'PHP Publishing', '36.98');
$product2 = new Media('Blue Ray', 'I am Legend', 'Francis Lawrence', 'Warner Home Video', '100', '25.99');

// display all the $_* properties from get* methods
echo '<p><em>$product1</em> is a ' . $product1->getProductType() . ' : &#8220;' . $product1->getProductTitle(). '&#8221; by ' . $product1->getProductAuthor() . ', ' . $product1->getProductEditor() . ' (' . $product1->getBookPageCount() . ' pages). Price: $' . $product1->getProductPrice() . '</p>' . "\n";

echo '<p><em>$product2</em> is a ' . $product2->getProductType() . ' called &#8220;' . $product2->getProductTitle() . '&#8221; by ' . $product2->getProductAuthor() . ', ' . $product1->getProductEditor() . ' (' . $product2->getMediaDuration() . ' minutes). Price: $' . $product2->getProductPrice() . '</p>' . "\n";

// include ending template. no PHP end tag here to prevent crashing display. Doh! Must works fine if I had'nt forget anything... 
require_once('view/html_end.inc.php');