From:
Operating system: Ubuntu 10.04
PHP version: 5.3SVN-2010-08-07 (snap)
Package: SPL related
Bug Type: Bug
Bug description:FilterIterator errantly returns null for first element
Description:
------------
Even when a FilterIterator subclass accepts all elements, it returns NULL
for the
first element in the original array. There are a few methods to correct
this
behavior, noted in the attached test script.
Test script:
---------------
<?php
class FooIterator extends FilterIterator {
/*
// Forces this class to produce expected behavior below
// (i.e. 1, 2, NULL instead of NULL, 2, NULL)
public function __construct(Iterator $iterator) {
parent::__construct($iterator);
$iterator->rewind();
}
*/
// Should cause all elements to be accepted
public function accept() {
return true;
}
/*
// Another way to force this class to produce expected behavior below
public function current() {
return $this->getInnerIterator()->current();
}
*/
}
$array = array(1, 2);
/*
// What should happen in subsequent blocks
$iterator1 = new ArrayIterator($array);
var_dump($iterator1->current()); // int(1)
$iterator1->next();
var_dump($iterator1->current()); // int(2)
$iterator1->next();
var_dump($iterator1->current()); // NULL
*/
// The problem
$iterator2 = new FooIterator(new ArrayIterator($array));
var_dump($iterator2->current()); // NULL <-- this should be int(1)
$iterator2->next();
var_dump($iterator2->current()); // int(2)
$iterator2->next();
var_dump($iterator2->current()); // NULL
// Exhibits correct behavior with no changes to FooIterator
$iterator3 = new FooIterator(new ArrayIterator($array));
$iterator3->rewind(); // This line shouldn't be needed, but is to force
expected behavior
var_dump($iterator3->current()); // int(1)
$iterator3->next();
var_dump($iterator3->current()); // int(2)
$iterator3->next();
var_dump($iterator3->current()); // NULL
Expected result:
----------------
int(1)
int(2)
NULL
int(1)
int(2)
NULL
Actual result:
--------------
NULL
int(2)
NULL
int(1)
int(2)
NULL
--
Edit bug report at http://bugs.php.net/bug.php?id=52560&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=52560&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=52560&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=52560&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=52560&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=52560&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=52560&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=52560&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=52560&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=52560&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=52560&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=52560&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=52560&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=52560&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=52560&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52560&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=52560&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=52560&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=52560&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=52560&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=52560&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=52560&r=mysqlcfg
