Creates a new set using values that aren't in another set

# Ds\Set::diff

(PECL ds >= 1.0.0)

Ds\Set::diff — Creates a new set using values that aren't in another set

### 説明

public Ds\Set::diff ( Ds\Set `$set` ) : Ds\Set

Creates a new set using values that aren't in another set.

`A \ B = {x ∈ A | x ∉ B}`

### パラメータ

`set`

  Set containing the values to exclude.

### 返り値

A new set containing all values that were not in the other `set`.

### See Also

- » Compliment on Wikipedia

### 例

例1 Ds\Set::diff() example

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

上の例の出力は、 たとえば以下のようになります。

    object(Ds\Set)#3 (2) {
      [0]=>
      int(1)
      [1]=>
      int(2)
    }