PHP で SplQueue::__construct() 関数を使用する方法は?

void SplQueue::__construct(void)

<?php
  
// Create a new empty queue
$q = new SplQueue();
  
$q [] = 1;
$q [] = 2;
$q [] = 3;
  
// Print the queue elements
echo $q [0] . "n" ;
echo $q [1] . "n" ;
echo $q [2] . "n" ;
?>

1
2
3

<?php
  
// Create some fixed size array
$gfg = new SplQueue();
  
$gfg [] = 1;
$gfg [] = 5;
$gfg [] = 1;
$gfg [] = 11;
$gfg [] = 15;
$gfg [] = 17;
  
foreach ( $gfg as $elem )  {
     echo $elem . "n" ;
}
?>

1
5
1
11
15
17