<?php
class Collection {
	private $items;
	public function __construct() {
		$this->items=array();
	}
	public function add($anObject){
		$this->items[]=$anObject;
	}
	public function indexOf($anObject) {
		return array_search($anObject,$this->items);
	}
	public function delete($index){
		if(array_key_exists($index, $this->items)){
			unset($this->items[$index]);
			$this->items=array_values($this->items);
		}
	}
	public function getItem($index){
		return $this->items[$index];
	}
	public function size(){
		return sizeof($this->items);
	}
	public function getItems(){
		return $this->items;
	}
}
?>