PHP | Ds\Deque __construct() Function

Last Updated : 14 Aug, 2019
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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 
<?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 
<?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

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