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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