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PHP | Ds\Deque clear() Function

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The Ds\Deque::clear() function is an inbuilt function in PHP which is used to clear the Deque by removing all elements from the Deque. Syntax:
public Ds\Deque::clear( void ) : void
Parameters: This function does not accepts any parameter. Return Value: This function does not return any Value. Below programs illustrate the Ds\Deque::clear() function in PHP: Program 1:
<?php
  
// Declare deque of default size
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
  
echo("Elements in the deck:\n");
  
// Display the Deque elements
print_r($deck);
  
// Use clear() function to clear the deque
$deck->clear();
  
// Display the deque
print_r($deck);
  
?> 

                    
Output:
Elements in the deck:
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)
Ds\Deque Object
(
)
Program 2:
<?php
  
// Declare deque of default size
$deck = new \Ds\Deque(["geeks", "for", "geeks"]);
  
echo("Elements in the Deque\n");
  
// Display the Deque elements
print_r($deck);
  
// Use clear() function to clear the deque
$deck->clear();
  
echo("Alter clearing the elements\n");
// Display the deque
print_r($deck);
  
?> 

                    
Output:
Elements in the Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)
Alter clearing the elements
Ds\Deque Object
(
)
Reference: http://php.net/manual/en/ds-deque.clear.php

Last Updated : 14 Aug, 2019
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