#43499 [Com]: Inproper use of extending class method from extended class.

[crrodriguez at suse dot de]

 ID:               43499
 Comment by:       crrodriguez at suse dot de
 Reported By:      bholbrook at servillian dot com
 Status:           Open
 Bug Type:         Scripting Engine problem
 Operating System: Linux Cent OS
 PHP Version:      5.2.5
 New Comment:

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php


http://php.net/manual/en/language.oop5.visibility.php

"Public declared items can be accessed **everywhere**".. and you have
an  instance of C class that extends A , so it is the expected
behaviuor..


Previous Comments:
------------------------------------------------------------------------

[2007-12-05 16:41:53] bholbrook at servillian dot com

$oB->method2() should work, but the call $this->method3() from
A::method1() should cause the same fatal error seen when calling it
through $oC->method4();

Class A should have no knowledge of it's extending classes methods.

------------------------------------------------------------------------

[2007-12-05 10:59:36] [EMAIL PROTECTED]

Output: 

I am method B::method2
I am method A::method1
I am method B::method3
I am method C::method4
I am method A::method1

Fatal error: Call to undefined method C::method3() in /home/jani/t.php
on line 6

Exactly what is wrong in this? AFAICT, it works exactly how it's
supposed to work.

------------------------------------------------------------------------

[2007-12-04 22:36:54] bholbrook at servillian dot com

Description:
------------
In the example, class A gains a knowledge of it's extending classes
functions. By allowing the call from the entended class to an extending
class method, the extended class method becomes unavailable to any other
extending class.

The only time this makes sense is if class A were an abstract class and
defined method3 as an abstract function.

Reproduce code:
---------------
<?php
class A {
        public function method1(){
                echo "I am method A::method1<br/>";
                $this->method3();
        }
}
class B extends A{
        public function method2(){
                echo "I am method B::method2<br/>";
                $this->method1();
        }
        public function method3(){
                echo "I am method B::method3<br/>";
        }
}
class C extends A{
        public function method4(){
                echo "I am method C::method4<br/>";
                $this->method1();
        }
}
$oB = new B();
$oB->method2();
$oC = new C();
$oC->method4();
?>

Expected result:
----------------
The expected result of $oB->method2(); is the current results of
$oC->method4();

Actual result:
--------------
Currently, $oB->method2() calls A::method1() (correct) which in turn
calls B::method3() (incorrect).


------------------------------------------------------------------------


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Edit this bug report at http://bugs.php.net/?id=43499&edit=1