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PHP - Manual: Ds\Set::union - 互联网笔记

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PHP - Manual: Ds\Set::union

2025-06-05

Ds\Set::union

(PECL ds >= 1.0.0)

Ds\Set::unionCreates a new set using values from the current instance and another set

说明

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

参数

set

The other set, to combine with the current instance.

返回值

A new set containing all the values of the current instance as well as another set.

参见

示例

示例 #1 Ds\Set::union() example

<?php
$a
= new \Ds\Set([1, 2, 3]);
$b = new \Ds\Set([3, 4, 5]);

var_dump($a->union($b));
?>

以上示例的输出类似于:

object(Ds\Set)#3 (5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
}
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官方地址:https://www.php.net/manual/en/ds-set.union.php

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