- var_dump: documentation ( source)
<?php
$list = new SplDoublyLinkedList();
$list->push('a');
$list->push('b');
$list->push('c');
$list->push('d');
$list->rewind();
$list->next();
$list->next();
$list->next();
var_dump($list->current()); // dumps d
unset($list[3]);
var_dump($list->current()); // dumps d