PHP | Ds\Deque __construct() Function

The Ds\Deque::__construct() function is an inbuilt function in PHP which is used to create a new instance.

Syntax:

Ds\Deque::__construct( $values )

Parameters: This function accepts single parameter $values which holds the traversable object or array to use initial values.

Below programs illustrate the Ds\Deque::__construct() function in PHP:

Program 1:

<?php

// Declare a deque
$deq = new \Ds\Deque();

// Display the elements of deque
echo("Elements of first deque:\n");
var_dump($deq);

// Declare a deque
$deq = new \Ds\Deque([10, 20, 30, 40, 50, 60]);

// Display the elements of deque
echo("\nElements of second deque:\n");
var_dump($deq);

?>

Output:

Elements of first deque:
object(Ds\Deque)#1 (0) {
}

Elements of second deque:
object(Ds\Deque)#2 (6) {
  [0]=>
  int(10)
  [1]=>
  int(20)
  [2]=>
  int(30)
  [3]=>
  int(40)
  [4]=>
  int(50)
  [5]=>
  int(60)
}

Program 2:

<?php

// Declare a deque
$deq = new \Ds\Deque(["geeks", "for", "geeks"]);

// Display the elements of deque
echo("Elements of first deque:\n");
print_r($deq);

// Declare a deque
$deq = new \Ds\Deque(['G', 'E', 'E', 'K', 'S', 1, 2, 3]);

// Display the elements of deque
echo("\nElements of second deque:\n");
print_r($deq);

?>

Output:

Elements of first deque:
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

Elements of second deque:
Ds\Deque Object
(
    [0] => G
    [1] => E
    [2] => E
    [3] => K
    [4] => S
    [5] => 1
    [6] => 2
    [7] => 3
)

Reference: https://www.php.net/manual/en/ds-deque.construct.php