SplObjectStorage::removeAllExcept

(PHP 5 >= 5.3.6, PHP 7)

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

Description

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

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

No value is returned.

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)

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https://www.php.net/manual/en/splobjectstorage.removeallexcept.php