SplObjectStorage::detach

(PHP 5 >= 5.1.0, PHP 7)

SplObjectStorage::detach — Removes an object from the storage

说明

public void SplObjectStorage::detach ( object $object )

Removes the object from the storage.

参数

object

The object to remove.

返回值

没有返回值。

范例

Example #1 SplObjectStorage::detach() example

<?php
$o = new StdClass;
$s = new SplObjectStorage();
$s->attach($o);
var_dump(count($s));
$s->detach($o);
var_dump(count($s));
?>

以上例程的输出类似于：

int(1)
int(0)

参见

User Contributed Notes

alan dot bem at gmail dot com 07-Sep-2013 04:55
SplObjectSotage::detach() has a bug - it rewinds internal array pointer.
Remember that - when looping over the storage - as it has no workaround.

https://bugs.php.net/bug.php?id=65629&edit=2
r dot wilczek at web-appz dot de 30-Apr-2010 10:18
Detaching the current entry from the storage prevents SplObjectStorage::next() to operate.

Example as a PHPUnit-test:

<?php
public function testDetachingCurrentPreventsNext()
{
    $storage = new SplObjectStorage;
    $storage->attach(new stdClass);
    $storage->attach(new stdClass);
    $storage->rewind();
    $iterated = 0;
    $expected = $storage->count();
    while ($storage->valid()) {
        $iterated++;
        $storage->detach($storage->current());
        $storage->next();
    }
    $this->assertEquals($expected, $iterated);
}
?>

This test will fail, for the iteration will never reach the second stdClass.
SplObjectStorage::next() obviously relies on the current element to be valid.

If you want to detach objects during iterations, you should dereference objects, before you call next() and detach the reference after next():

<?php
public function testDetachingReferenceAfterNext()
{
    $storage = new SplObjectStorage;
    $storage->attach(new stdClass);
    $storage->attach(new stdClass);
    $storage->rewind();
    $iterated = 0;
    $expected = $storage->count();
    while ($storage->valid()) {
        $iterated++;
        $object = $storage->current();
        $storage->next();
        $storage->detach($object);
    }
    $this->assertEquals($expected, $iterated);
}
?>

This test will pass.