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PHP | Ds\Set allocate() Function

Last Updated : 11 Jul, 2025
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The Ds\Set::allocate() function is an inbuilt function in PHP which is used to allocate memory for required capacity. Syntax: 
void public Ds\Set::allocate( $capacity )
Parameters: This function accepts single parameter $capacity which holds the value of capacity to be allocated. Capacity always rounded in powers of 2. Return value: This function does not return any values. Below programs illustrate the Ds\Set::allocate() function in PHP: Program 1: php 
<?php 

// Declare new empty set 
$set = new \Ds\Set(); 

echo("Allocated Space is: "); 

// Use capacity() function 
var_dump($set->capacity());  

// Use allocate() function to 
// allocate capacity 
$set->allocate(50); 

echo("Allocated space is: ");

// Display the allocated vector 
// capacity 
var_dump($set->capacity()); 

?>
Output: 
Allocated Space is: int(8)
Allocated space is: int(64)
Program 2: php 
<?php 

// Declare an empty set 
$set = new \Ds\Set();

echo("Allocated Space is: "); 

// Use capacity() function 
var_dump($set->capacity());  

// Use allocate() function to 
// allocate capacity 
$set->allocate(5); 

echo("Allocated space is: ");

// Display the capacity 
var_dump($set->capacity()); 

echo("Allocated space is: ");

// Use allocate() function to 
// allocate capacity 
$set->allocate(120); 

// Display the capacity 
var_dump($set->capacity()); 
?>
Output: 
Allocated Space is: int(8)
Allocated space is: int(8)
Allocated space is: int(128)
Reference: https://www.php.net/manual/en/ds-set.allocate.php

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