PHP SplQueue::__construct() Function

The SplQueue::__construct() function is an inbuilt function in PHP which is used to construct a queue which is implemented using a doubly-linked list.

Syntax:

void SplQueue::__construct(void)

Parameters: This function does not accept any parameter.

Return Value: This function does not return any value.

Below programs illustrate the SplQueue::__construct() function in PHP:

Program 1:

<?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";
?>

Output:

1
2
3

Program 2:

<?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";
}
?>

Output:

1
5
1
11
15
17