From: [email protected]
Operating system: Linux x86_64
PHP version: 5.3.0
PHP Bug Type: Scripting Engine problem
Bug description: Late Static Binding class name problem
Description:
------------
In some cases the class name as returned by get_called_class() is
incorrect.
Can't explain this clearly without more sleep, but the following
reproduction code should help understanding the problem.
I tried to simplify the code, but the bug disappears in this case.
Expected behaviour is to have class C constructed, then class B
constructed, with a nice "Here is B\n" displayed.
In reality the B::getInstance() static call done from C::__construct
doesn't change the classname for LSB, meaning that when
Singleton::getInstance() will call get_called_class() it will receive "C"
(and letting us enter into an infinite recursion).
Reproduce code:
---------------
<?php
abstract class Singleton {
private static $singleton = array();
public function getInstance() {
$class = get_called_class();
if (!isset(self::$singleton[$class])) {
self::$singleton[$class] = new $class();
}
return self::$singleton[$class];
}
abstract protected function __construct();
}
class B extends Singleton {
protected function __construct() {
echo "Here is B\n";
}
}
class C extends Singleton {
protected function __construct() {
B::getInstance();
}
}
C::getInstance();
Expected result:
----------------
Here is B
Actual result:
--------------
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 523800 bytes) in foo.php on line 25
--
Edit bug report at http://bugs.php.net/?id=49204&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=49204&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=49204&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=49204&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=49204&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=49204&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=49204&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=49204&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=49204&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=49204&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=49204&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=49204&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=49204&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=49204&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=49204&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49204&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=49204&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=49204&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=49204&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=49204&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=49204&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=49204&r=mysqlcfg
