PHP | Ds\Set union() Function

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The Ds\Set::union() function is an inbuilt function in PHP which is used to create a new set which contains the union of two sets.

Syntax:

Ds\Set public Ds\Set::union ( Ds\Set $set )

Parameters: This function accepts a single parameter $set which holds the other set of the instance to combine with the current instance.

Return value: It returns a set which contains the union of two sets.

Below programs illustrate the Ds\Set::union() function in PHP:

Program 1:

<?php  
  
// Declare a new set 
$a = new \Ds\Set([2, 3, 6]);  
  
// Declare another new set 
$b = new \Ds\Set([2, 4, 6, 7]);  
  
// Print the Union of both set 
echo("Union of both set is: \n");  
  
print_r($a->union($b)); 
  
?> 

Output:

Union of both set is: 
Ds\Set Object
(
    [0] => 2
    [1] => 3
    [2] => 6
    [3] => 4
    [4] => 7
)

Program 2:

<?php  
  
// Declare a new set 
$a = new \Ds\Set([2, 3, 6, 7, 8]);  
  
// Declare another new set 
$b = new \Ds\Set([2, 3, 5, 8, 9, 10]);  
  
// Print the union of both set 
echo("Union of both set is: \n");  
  
var_dump($a->union($b)); 
  
?> 

Output:

Union of both set is: 
object(Ds\Set)#3 (8) {
  [0]=>
  int(2)
  [1]=>
  int(3)
  [2]=>
  int(6)
  [3]=>
  int(7)
  [4]=>
  int(8)
  [5]=>
  int(5)
  [6]=>
  int(9)
  [7]=>
  int(10)
}

Reference: https://www.php.net/manual/en/ds-set.union.php