(PECL ds >= 1.0.3)
Ds\Set::merge — Returns the result of adding all given values to the set
Returns the result of adding all given values to the set.
valuesA traversable object or an array.
The result of adding all given values to the set, effectively the same as adding the values to a copy, then returning that copy.
Note:
The current instance won't be affected.
Example #1 Ds\Set::merge() example
<?php
$set = new \Ds\Set([1, 2, 3]);
var_dump($set->merge([3, 4, 5]));
var_dump($set);
?>
以上例程的输出类似于：
object(Ds\Set)#2 (6) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
int(4)
[4]=>
int(5)
}
object(Ds\Set)#1 (3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}