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PHP | Ds\Set capacity() Function

Last Updated : 11 Jul, 2025
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The Ds\Set::capacity() function is an inbuilt function in PHP which is used to return the capacity of the set. Syntax: 
int public Ds\Set::capacity( void )
Parameter: This function does not accepts any parameter. Return value: This function returns the current capacity of set. Below programs illustrate the Ds\Set::capacity() function in PHP: Program 1: php 
<?php 

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

echo("Default size of Set: "); 

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

// Allocating space for 50 values
$set->allocate(50); 

echo("Allocated size of Set: "); 

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

?>
Output: 
Default size of Set: int(8)
Allocated size of Set: int(64)
Program 2: php 
<?php 

// Declare a set
$set = new \Ds\Set([1, 2, 3, 4, 5, 6]); 

echo("Elements of Set\n"); 

// Display the Set elements 
var_dump($set); 

echo("\nCapacity of Set: "); 

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

?>
Output: 
Elements of Set
object(Ds\Set)#1 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

Capacity of Set: int(8)
Reference: https://www.php.net/manual/en/ds-set.capacity.php

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