From:
Operating system: all
PHP version: 5.3.2
Package: Class/Object related
Bug Type: Feature/Change Request
Bug description:static properties in subclasses should take on own value w/o
redeclaration
Description:
------------
Something I've found quite annoying about the Late Static Binding
implementation
is the need to re-declare static variables in subclasses to allow them to
have
their own values. (see Test Script)
In order to get the desired results, you need to re-declare the static
variable
in the subclasses, which of course goes against every fundamental principle
of
DRY if you're going to have a large number of subclasses and static
properties.
I can't find a work-around to this other than to re-declare the static
variables, which sort of puts us in the same boat we were in before 5.3
when we
would need to redeclare static methods in subclasses too.
I'm not sure why this is behaving this way-- if you don't want subclasses
to
have their own value, you should make it private or use the self:: keyword
when
referencing the variable in the superclass.
There is a note on the PHP Late Static Binding page that reads "static::
does
not work like $this for static methods! $this-> follows the rules of
inheritance
while static:: doesn't. This difference is detailed later on this manual
page."
but the difference is NOT detailed later on that page, and I can't find any
details whatsoever.
Test script:
---------------
<?php
class Foo {
protected static $whoAmI;
public static function init() {
static::$whoAmI = get_called_class();
}
public static function who() {
echo static::$whoAmI."\n";
}
}
class BarOne extends Foo {}
class BarTwo extends Foo {}
BarOne::init(); // sets the whoAmI property in Foo to BarOne
BarTwo::init(); // sets the whoAmI property in Foo to BarTwo
BarOne::who(); // outputs "BarTwo"
BarTwo::who(); // also outputs "BarTwo"
Expected result:
----------------
BarOne
BarTwo
Actual result:
--------------
BarTwo
BarTwo
--
Edit bug report at http://bugs.php.net/bug.php?id=51720&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=51720&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=51720&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=51720&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=51720&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=51720&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=51720&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=51720&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=51720&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=51720&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=51720&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=51720&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=51720&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=51720&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=51720&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51720&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51720&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=51720&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=51720&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=51720&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=51720&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=51720&r=mysqlcfg
