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PHP | Ds\Deque copy() Function

Last Updated : 11 Jul, 2025
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The Ds\Deque::copy() function is an inbuilt function in PHP which is used to return a copy of the Deque. This will return a shallow copy of the Deque. Syntax: 
public Ds\Deque::copy ( void ) : Ds\Deque
Parameters: This function does not contain any parameter. Return Value: This function returns a copy of the Deque elements. Below programs illustrate the Ds\Deque::copy() function in PHP: Program 1: PHP 
<?php

// Declare deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);

echo("Elements in the Deque\n");

// Display the Deque elements
var_dump($deck);

// Use copy() function to 
// copy the Deque
$deck_copy = $deck->copy();

echo("\nCopy Deque elements\n");

// Display the Deque elements
var_dump($deck_copy);

?>
Output: 
Elements in the Deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

Copy Deque elements
object(Ds\Deque)#2 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}
Program 2: PHP 
<?php

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

echo("Elements in the Deque\n");

// Display the Deque elements
print_r($deck);

// Use copy() function to 
// copy the Deque
$deck_copy = $deck->copy();

echo("\nCopy Deque elements\n");

// Display the Deque elements
print_r($deck_copy);

?>
Output: 
Elements in the Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

Copy Deque elements
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)
Reference: https://www.php.net/manual/en/ds-deque.copy.php

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