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PHP | Ds\Deque apply() Function
  • Last Updated : 14 Aug, 2019

The Ds\Deque::apply() function is an inbuilt function in PHP which is used to update the values of Deque by performing operations as defined by the callback function.

Syntax:

public Ds\Deque::apply( $callback ) : void

Parameters: This function accepts single parameter $callback which holds the function define the operation to be performed on each element of the Deque.

Return value: This function does not return any value.

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



Program 1:




<?php
  
// Declare deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
  
echo("\nElements in the deque are\n");
  
// Display the deque elements
print_r($deck);
  
// Use apply() function to implement
// the operation
$deck->apply(function($element) { 
    return $element * 10; 
});
  
echo("\nUpdated elements in the deque\n");
  
// Display the deque elements
print_r($deck);
  
?> 
Output:
Elements in the deque are
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)

Updated elements in the deque
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
    [5] => 60
)

Program 2:




<?php
  
// Declare deque
$deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]);
  
echo("\nElements in the deque are\n");
  
// Display the deque elements
print_r($deck);
  
// Use apply() function to implement
// the operation
$deck->apply(function($element) { 
    return $element % 10; 
});
  
echo("\nUpdated elements in the deque\n");
  
// Display the deque elements
print_r($deck);
  
?> 
Output:
Elements in the deque are
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
    [5] => 60
)

Updated elements in the deque
Ds\Deque Object
(
    [0] => 0
    [1] => 0
    [2] => 0
    [3] => 0
    [4] => 0
    [5] => 0
)

Reference: http://php.net/manual/en/ds-deque.apply.php

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