PHP SplQueue::__construct() Function

Last Updated : 07 Mar, 2024

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"; 
} 
?> 