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)
}
