/**
* add an item to the “end” (tail) of the queue
* @param $value
*/
public function enqueue($value)
{
$newNode = new LinkedListNode($value);
if ($this->isEmpty()) {
$this->head = $newNode;
$this->tail = $newNode;
} else {
$currentTail = $this->tail;
$newNode->setNext($currentTail);
$this->tail = $newNode;
}
}
/**
* @return int
*/
public function count()
{
if ($this->count === null) {
$this->rewind();
$count = 0;
while ($this->current) {
$count++;
$this->current = $this->current->getNext();
}
$this->count = $count;
}
return $this->count;
}
/**
* @return mixed
*/
public function peek()
{
return $this->top->getData();
}
