PHP | Ds\Map allocate() Function

The Ds\Map::allocate() function is an inbuilt function in PHP which is used to allocate enough memory for required capacity.

Syntax:

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

Parameters: This function accepts single parameter $capacity which indicate number of capacity allocated.

Return Value: This function does not return any values.

Below programs illustrate the Ds\Map::allocate() function in PHP:

Program 1:

<?php

// Create new map
$map = new \Ds\Map();

// Use capacity() function to
// display the capacity of map
var_dump($map->capacity());

// Allocate capacity
$map->allocate(50);

// Display capacity
var_dump($map->capacity());

// Allocate capacity
$map->allocate(80);

// Display capacity
var_dump($map->capacity());
?>

Output:

int(8)
int(64)
int(128)

Program 2:

<?php

// Create new map
$map = new \Ds\Map();

// Declare capacity array
$arr = array(10, 20, 30, 40);

// Loop run for every array element
foreach ($arr as $val) {

    // Allocate capacity
    $map->allocate($val);

    // Display capacity of map
    var_dump($map->capacity());
}

?>

Output:

int(16)
int(32)
int(32)
int(64)

Reference: https://www.php.net/manual/en/ds-map.allocate.php