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Bug #63482 register_tick_function() does not work correctly with private methods
Submitted: 2012-11-10 19:12 UTC Modified: 2012-11-10 20:42 UTC
From: dev at pp3345 dot de Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.4.8 OS: Debian Squeeze
Private report: No CVE-ID: None
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 [2012-11-10 19:12 UTC] dev at pp3345 dot de 
Description:
------------
Registering a private method as a tick function leads to two errors on every tick.

Test script:
---------------
<?php
declare(ticks = 1);

class A {
        public function __construct() {
                register_tick_function(array($this, 'a'));
        }

        private function a() {
                echo 'Called';
        }
}

new A;

?>


Expected result:
----------------
CalledCalledCalled

Actual result:
--------------
Called
Warning: Invalid callback A::a, cannot access private method A::a() in 
/var/vhosts/pancake/default/register_tick_function.php on line 15

Warning: main(): Unable to call A::a() - function does not exist in 
/var/vhosts/pancake/default/register_tick_function.php on line 15

Warning: Invalid callback A::a, cannot access private method A::a() in 
/var/vhosts/pancake/default/register_tick_function.php on line 17

Warning: main(): Unable to call A::a() - function does not exist in 
/var/vhosts/pancake/default/register_tick_function.php on line 17

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 [2012-11-10 20:42 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2012-11-10 20:42 UTC] nikic@php.net 
As the tick function is not called in the class scope it also can't access its private methods. That's the whole point of private methods. This is also not specific to ticks, its the same with all private-method callbacks: They will only work if they are invoked from within the class.
 [2012-11-10 21:11 UTC] dev at pp3345 dot de 
I understand that private methods can not be called from outside the class. But I 
believe that register_tick_function() should disallow registering private or 
protected methods or at least there should only be ONE error after leaving the 
class scope. Probably PHP should automatically recognize that the class scope was 
left, unregister the tick function and issue a notice.

As far as I remember, private methods are fully supported as class autoloaders and 
work even when loading a class outside the class scope of the registered private 
method. This behavior is somewhat inconsistent.
 
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