PHP Manual
Set
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

说明

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}

参数

set: Set containing the values to exclude.

返回值

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

See Also

» Compliment on Wikipedia

范例

Example #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));
?>

以上例程的输出类似于：

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

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