Stack implementation using array

stack.php

<?php	

	/**
	* Implement a stack using array. LIFO. No SPL.
	* @author thachp
	*/
	class Stack {	
		
		// dynamic type
		private $_stack = array();			
		
		// Move the first item in the array out.
		public function pop($item)		
		{	
			array_shift($this->_stack);
		}		
				
			
		// Add item to the last item.
		public function push($item)
		{
			array_unshift($this->_stack, $item);
		}	
				
		// get stack
		public function getStack()
		{
			return $this->_stack;
		}		
		
	}
	
	
	$stack = new Stack();
	$stack->push('a');
	$stack->push('b');
	$stack->push('c');	
	
	// expect an array of c,b,a
	print_r($stack->getStack());
	
	$stack->pop();	
	// expect an array of b,a
	print_r($stack->getStack());
	
?>