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PHP | Ds\Map allocate() Function

Last Updated : 20 Aug, 2019
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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 
<?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 
<?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

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