PHP | Ds\Deque capacity() Function

The Ds\Deque::capacity() function is an inbuilt function in PHP which is used to get the current capacity of the Deque.

Syntax:

public Ds\Deque::capacity( void ) : int

Parameters: This function does not accepts any parameter.

Return Value: This function returns the current capacity of the Deque.

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

Program 1:

<?php

// Allocating deque of default size
$deck = new \Ds\Deque();

echo("Default size of Deque: ");

// Display the current capacity of the deque
var_dump($deck->capacity());

// Allocating space for 50 values to the deque
$deck->allocate(50);

echo("Allocated size of Deque: ");

// Display the current capacity of the deque
var_dump($deck->capacity());

?>

Output:

Default size of Deque: int(8)
Allocated size of Deque: int(64)

Program 2:

<?php

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

echo("Elements of Deque\n");

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

echo("\nCapacity of Deque: ");

// Display the capacity of Deque
var_dump($deck->capacity());

?>

Output:

Elements of Deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

Capacity of Deque: int(8)

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