PHP | Ds\Deque capacity() Function

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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

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