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 $deck = new \Ds\Deque(["neveropen", "for", "neveropen"]);   echo("Elements in the Deque\n");   // Display the Deque elements print_r($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] => neveropen
[1] => for
[2] => neveropen
)
Alter clearing the elements
Ds\Deque Object
(
)
Reference: http://php.net/manual/en/ds-deque.clear.php
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