<?php

class Item
{	
	var $name;
	var $price;
	var $order;
	
	function __construct($_name, $_price, $_order)
	{
		$this->name = $_name;
		$this->price = $_price;
		$this->order = $_order;
	}
}

$arrayOfItems = array(
	new Item ("Glass", 3.44, 4),
	new Item ("Cup", 10.43, 2),
	new Item ("Plate", 9.02, 3),
	new Item ("Fork", 0.10, 1),
	new Item ("Spoon", 34.87, 5)
	);
	
usort($arrayOfItems, array("ItemSorter", "ComparisonDelegateByOrder"));
PrintItemArray($arrayOfItems, "ComparisonDelegateByOrder");

usort($arrayOfItems, array("ItemSorter", "ComparisonDelegateByName"));
PrintItemArray($arrayOfItems, "ComparisonDelegateByName");

usort($arrayOfItems, array("ItemSorter", "ComparisonDelegateByPrice"));
PrintItemArray($arrayOfItems, "ComparisonDelegateByPrice");


function PrintItemArray($arrayOfItems, $delegateName)
{
	echo "****************** $delegateName **********************";
	foreach ($arrayOfItems as $key => $value) {
		echo "<pre>";
		print_r($value);
		echo "</pre>";
	}
}

class ItemSorter
{
	function ComparisonDelegateByOrder($a, $b)
	{
		return self::ComparisonDelegate($a, $b, "order");
	}
	
	function ComparisonDelegateByName($a, $b)
	{
		return self::ComparisonDelegate($a, $b, "name");
	}
	
	function ComparisonDelegateByPrice($a, $b)
	{
		return self::ComparisonDelegate($a, $b, "price");
	}
	
	function ComparisonDelegate($a, $b, $field)
	{
		if ($a->$field == $b->$field) {
			return 0;
		}
		return ($a->$field < $b->$field) ? -1 : 1;
	}

}

//