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<?php

$queue = new SplQueue();
$queue->setIteratorMode(SplQueue::IT_MODE_DELETE);

$queue->enqueue('1');
$queue->enqueue('2');
$queue->enqueue('3');

$queue->dequeue();
$queue->dequeue();

echo $queue->top();

$queue = new SplPriorityQueue();
$queue->setIteratorMode(SplPriorityQueue::EXTR_DATA);

$queue->insert('Q', '1');
$queue->insert('W', '2');
$queue->insert('E', '3');
$queue->insert('R', '4');
$queue->insert('T', '5');
$queue->insert('Y', '6');

$queue->top();

while($queue->valid()) {
    echo $queue->current();
    $queue->next();
}