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PHP | Ds\Set clear() Function

Last Updated : 11 Jul, 2025
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The Ds\Set::clear() function is an inbuilt function in PHP which is used to remove all values from the set. Syntax: 
void public Ds\Set::clear( void )
Parameters: This function does not accept any parameter. Return value: This function does not return any value. Below programs illustrate the Ds\Set::clear() function in PHP: Program 1: php 
<?php 

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

// Display the Set element 
print_r($set); 

// Use clear() function to remove elements 
$set->clear(); 

// Display the Set element 
print_r($set); 

?>
Output: 
Ds\Set Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)
Ds\Set Object
(
)
Program 2: php 
<?php 

// Declare new Set
$set = new \Ds\Set([10, 15, 21, 13, 16, 18]); 

// Display the Set element 
var_dump($set); 
  
// Use clear() function to remove elements 
$set->clear(); 
  
// Display the Set element 
var_dump($set); 
  
?>
Output: 
object(Ds\Set)#1 (6) {
  [0]=>
  int(10)
  [1]=>
  int(15)
  [2]=>
  int(21)
  [3]=>
  int(13)
  [4]=>
  int(16)
  [5]=>
  int(18)
}
object(Ds\Set)#1 (0) {
}
Reference: https://www.php.net/manual/en/ds-set.clear.php

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