SplObjectStorage::detach

(PHP 5 >= 5.1.0)

SplObjectStorage::detachRemoves an object from the storage

Descrierea

public void SplObjectStorage::detach ( object $object )

Removes the object from the storage.

Parametri

object

The object to remove.

Valorile întoarse

Nu este întoarsă nici o valoare.

Exemple

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));
?>

Exemplul de mai sus va afișa ceva similar cu:

int(1)
int(0)

Vedeți de asemenea

add a note add a note

User Contributed Notes 2 notes

up
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
1 year 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
To Top