Online PHP editor | output for EJCaI

<?php class Node { /** @var Node */ public $previous; /** @var Node */ public $next; } $firstNode = new Node(); $firstNode->previous = $firstNode; $firstNode->next = $firstNode; $circularDoublyLinkedList = $firstNode; var_dump(gc_enabled()); for ($i = 0; $i < 160000; $i++) { $currentNode = $circularDoublyLinkedList; $nextNode = $circularDoublyLinkedList->next; $newNode = new Node(); $newNode->previous = $currentNode; $currentNode->next = $newNode; $newNode->next = $nextNode; $nextNode->previous = $newNode; $circularDoublyLinkedList = $nextNode; } var_dump('this line will not be reached');