SplObjectStorage::removeAllExcept

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

Description

public int SplObjectStorage::removeAllExcept(SplObjectStorage $storage)

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)