#37854 [NEW]: Type Hinting with derived classes and interfaces not working
From: spam at codeword dot net
Operating system: Win XP
PHP version: 5.1.4
PHP Bug Type: Class/Object related
Bug description: Type Hinting with derived classes and interfaces not working
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 bug report at http://bugs.php.net/?id=37854&edit=1
--
Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=37854&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=37854&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=37854&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=37854&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=37854&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=37854&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=37854&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=37854&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=37854&r=support
Expected behavior: http://bugs.php.net/fix.php?id=37854&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=37854&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=37854&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=37854&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=37854&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=37854&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=37854&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=37854&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=37854&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=37854&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=37854&r=mysqlcfg
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