PHP5.5 SplQueue

 
<?php
// FIFO
$queue = new SplQueue();
echo "Enqueue\\n";
$queue->enqueue('A');
$queue->enqueue('B');
$queue->enqueue('C');
$queue->push('D');
$queue[] = 'E';
  
foreach($queue as $val) {
    echo $val. "\\n";
}
  
echo "Dequeue\\n";
  
$queue->dequeue();
foreach($queue as $val) {
    echo $val. "\\n";
}
?>