PHP 5.6.0 released

SplObjectStorage::detach

(PHP 5 >= 5.1.0)

SplObjectStorage::detachRemoves an object from the storage

Beschreibung

public void SplObjectStorage::detach ( object $object )

Removes the object from the storage.

Parameter-Liste

object

The object to remove.

Rückgabewerte

Es wird kein Wert zurückgegeben.

Beispiele

Beispiel #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));
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

int(1)
int(0)

Siehe auch

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User Contributed Notes 2 notes

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3
r dot wilczek at web-appz dot de
4 years ago
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.
up
0
alan dot bem at gmail dot com
11 months ago
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
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