PHP | Ds\Stack clear() Function

The Ds\Stack::clear() function of PHP is used to remove all elements from a Stack and clear it. This function simply removes all of the elements from the Stack but not completely deletes it. It just empties it.

Syntax:  

void public Ds\Stack::clear ( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

Below programs illustrate the Ds\Stack::clear() function:

Program 1:

PHP

<?php

// PHP program to illustrate the
// Ds\stack::clear() function

// Create a Stack instance
$stack = new \Ds\Stack();

// Pushing elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");

// Print the stack
print_r($stack);

// clear the stack
$stack->clear();

// Print the stack again
print_r($stack);

?>

Output:

Ds\Stack Object
(
    [0] => GfG
    [1] => to
    [2] => Welcome
)

Ds\Stack Object
(

)

Program 2:

PHP

<?php

// PHP program to illustrate the
// Ds\stack::clear() function

// Create a Stack instance
$stack = new \Ds\Stack();

// Pushing Mixed value elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");
$stack->push(10);
$stack->push(5.5);

// Print the stack
print_r($stack);

// clear the stack
$stack->clear();

// Print the stack again
print_r($stack);

?>

Output:

Ds\Stack Object
(
    [0] => 5.5
    [1] => 10
    [2] => GfG
    [3] => to
    [4] => Welcome
)

Ds\Stack Object
(

)

Reference: http://php.net/manual/en/ds-stack.clear.php