SplObjectStorage::removeAllExcept

(PHP 5 >= 5.3.6, PHP 7, PHP 8)

SplObjectStorage::removeAllExcept — Removes all objects except for those contained in another storage from the current storage

Description

public SplObjectStorage::removeAllExcept(SplObjectStorage $storage): int

Removes all objects except for those contained in another storage from the current storage.

Parameters

storage

The storage containing the elements to retain in the current storage.

Return Values

Returns the number of remaining objects.

Examples

Example #1 SplObjectStorage::removeAllExcept() example

<?php
$a = (object) 'a';
$b = (object) 'b';
$c = (object) 'c';

$foo = new SplObjectStorage;
$foo->attach($a);
$foo->attach($b);

$bar = new SplObjectStorage;
$bar->attach($b);
$bar->attach($c);

$foo->removeAllExcept($bar);
var_dump($foo->contains($a));
var_dump($foo->contains($b));
?>

The above example will output something similar to:

bool(false)
bool(true)