Ds\Set::union

(PECL ds >= 1.0.0)

Ds\Set::union — Creates a new set using values from the current instance and another set.

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

Creates a new set that contains the values of the current instance as well as the values of another set.

A ∪ B = {x: x ∈ A ∨ x ∈ B}