TStack implements a stack.
The typical stack operations are implemented, which include
{@link push()}, {@link pop()} and {@link peek()}. In addition,
{@link contains()} can be used to check if an item is contained
in the stack. To obtain the number of the items in the stack,
check the {@link getCount Count} property.
Items in the stack may be traversed using foreach as follows,
foreach($stack as $item) ...
public function testGetCount()
{
$stack = new TStack();
self::assertEquals(0, $stack->getCount());
$stack = new TStack(array(1, 2, 3));
self::assertEquals(3, $stack->getCount());
}
