array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'ds-set.union.php', 1 => 'Ds\\Set::union', 2 => 'Creates a new set using values from the current instance and another set', ), 'up' => array ( 0 => 'class.ds-set.php', 1 => 'Ds\\Set', ), 'prev' => array ( 0 => 'ds-set.toarray.php', 1 => 'Ds\\Set::toArray', ), 'next' => array ( 0 => 'ds-set.xor.php', 1 => 'Ds\\Set::xor', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/ds/ds/set/union.xml', ), 'history' => array ( ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

Ds\Set::union

(PECL ds >= 1.0.0)

Ds\Set::union — Creates 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)
}