PHP Ds\Set reverse() Function
Last Updated :
11 Jul, 2025
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The Ds\Set::reverse() function of Ds\Set class in PHP is an inbuilt function which is used to reverse the order of elements present in the Set instance. This function reverses the Set in-place. That is, it does not uses any extra space and updates the original Set instance with reversed values.
Syntax:
php
php
void public Ds\Set::reverse ( void )Parameters: This function does not accepts any parameters. Return Value: This function does not returns any value. It reverses the order of elements in the actual Set instance. Below programs illustrate the Ds\Set::reverse() function: Program 1:
<?php
// Declare new Set
$set = new \Ds\Set(["10", "20", "30"]);
// Display the initial Set element
echo "Initial Set: \n";
var_dump($set);
// Reverse the set
$set->reverse();
// Print the reversed Set
echo "\nReversed Set is: \n";
var_dump($set);
?>
Output:
Program 2:
Initial Set:
object(Ds\Set)#1 (3) {
[0]=>
string(2) "10"
[1]=>
string(2) "20"
[2]=>
string(2) "30"
}
Reversed Set is:
object(Ds\Set)#1 (3) {
[0]=>
string(2) "30"
[1]=>
string(2) "20"
[2]=>
string(2) "10"
}
<?php
// Declare new Set
$set = new \Ds\Set(["Geeks", "for", "Keegs"]);
// Display the initial Set element
echo "Initial Set: \n";
var_dump($set);
// Reverse the set
$set->reverse();
// Print the reversed Set
echo "\nReversed Set is: \n";
var_dump($set);
?>
Output:
Reference: https://www.php.net/manual/en/ds-set.reverse.php
Initial Set:
object(Ds\Set)#1 (3) {
[0]=>
string(5) "Geeks"
[1]=>
string(3) "for"
[2]=>
string(5) "Keegs"
}
Reversed Set is:
object(Ds\Set)#1 (3) {
[0]=>
string(5) "Keegs"
[1]=>
string(3) "for"
[2]=>
string(5) "Geeks"
}
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