#37854 [Opn->Bgs]: Type Hinting with derived classes and interfaces not working
ID: 37854
Updated by: helly@php.net
Reported By: spam at codeword dot net
-Status: Open
+Status: Bogus
Bug Type: Class/Object related
-Operating System: Win XP
+Operating System: *
-PHP Version: 5.1.4
+PHP Version: *
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
First we don't allow changesin the typhints in derived
classes/implementing classes. Second you need to learn inheritance
rules again. Your code would break is-a relation.
Previous Comments:
------------------------------------------------------------------------
[2006-06-19 22:11:34] spam at codeword dot net
Description:
------------
When adding type hinting to an interface then implementing that
interface using a derived class, the script compiler does not seem to
recognise that the implemented type hint is derived from the interfaces
type hint. I hope that makes sense. The code below may be more clear.
Reproduce code:
---------------
<?php
interface MyInterface{public function test(ClassA $object);}
class MyClass implements myInterface{
public function test(ClassB $object){// should work but does not
echo $object->x;
}
}
class ClassA {public$x = "Class is ClassA"; }
class ClassB extends ClassA{ public $x = "Class is ClassB";}
$myclass = new MyClass;
$a = new ClassA;
$b = new ClassB;
$myclass->test($b);
$myclass->test($a);
?>
Expected result:
----------------
Class is ClassB
Fatal error: Argument 1 passed to MyClass::test() must be an instance
of ClassB, called in typeHintTest.php on line 14 and defined in
typeHintTest.php on line 4
Actual result:
--------------
Fatal error: Declaration of MyClass::test() must be compatible with
that of MyInterface::test() in typeHintTest.php on line 3
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=37854&edit=1
Thread (5 messages)