PHP Manual: Allocates enough memory for a required capacity

public void Ds\Map::allocate(int $capacity)

Allocates enough memory for a required capacity.

capacity: The number of values for which capacity should be allocated.

Note:
Capacity will stay the same if this value is less than or equal to the current capacity.

Note:
Capacity will always be rounded up to the nearest power of 2.

No value is returned.

Example #1 Ds\Map::allocate example

<?php
$map = new \Ds\Map();
var_dump($map->capacity());

$map->allocate(100);
var_dump($map->capacity());
?>

The above example will output something similar to:

int(16)
int(128)