SplObjectStorage::removeAllExcept()

(PHP 5 >= 5.3.6, PHP 7)

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

说明

publicSplObjectStorage::removeAllExcept( SplObjectStorage$storage) : void

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

参数

$storage

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

返回值

没有返回值。

范例

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));
?>

以上例程的输出类似于：

bool(false)
bool(true)

The example Kirk provided is not the best option, there's a method "removeAll" that you can pass the SplObjectStore itself, and as the name says, remove all stored objects.

You may remove all elements by passing empty SplObjectStorage
$splStorage->removeAllExcept(new SplObjectStorage());