(PECL ds >= 1.0.0)
Ds\Set::xor — Creates a new set using values in either the current instance or in another set, but not in both
Creates a new set containing values in the current instance as well as another set,
but not in both.
A ? B = {x : x ∈ (A \ B) ∪ (B \ A)}
setThe other set.
A new set containing values in the current instance as well as another set,
but not in both.
Example #1 Ds\Set::xor() example
<?php
$a = new \Ds\Set([1, 2, 3]);
$b = new \Ds\Set([3, 4, 5]);
var_dump($a->xor($b));
?>
以上例程的输出类似于：
object(Ds\Set)#3 (4) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(4)
[3]=>
int(5)
}