Bug #75590 [Opn]: Fatal error when removing optional argument in subclass (BC break).
| From: | christoph at burschka dot de | Date: | Wed, 29 Nov 2017 17:08:55 +0000 |
| Subject: | Bug #75590 [Opn]: Fatal error when removing optional argument in subclass (BC break). | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-212808@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=75590&edit=1
ID: 75590
User updated by: christoph at burschka dot de
Reported by: christoph at burschka dot de
Summary: Fatal error when removing optional argument in
subclass (BC break).
Status: Open
Type: Bug
Package: *General Issues
Operating System: MacOS
PHP Version: 7.2.0RC6
Block user comment: N
Private report: N
New Comment:
Also note: If the interface declares the optional argument as well, then the result is a fatal error
in both 7.1.11 and 7.2.0RC6.
Previous Comments:
------------------------------------------------------------------------
[2017-11-29 17:02:56] christoph at burschka dot de
Description:
------------
In this inheritance chain, an interface defines a function without an argument, then an implementing
class adds an optional argument, and a subclass defines the function with the original signature
from the interface (no argument).
This works in PHP 7.1.11, but triggers E_ERROR in PHP 7.2.0RC6.
(Note: Without the interface, simply removing an optional argument in a subclass is E_WARNING on
both 7.1.11 and 7.2.0RC6.)
Test script:
---------------
interface A {
public function f();
}
class B implements A {
public function f(A $x = NULL) {}
}
class C extends B {
public function f() {}
}
Expected result:
----------------
Same behavior in PHP 7.2.0RC6 as PHP 7.1.11, or at worst a non-fatal warning/deprecation.
Actual result:
--------------
No warning in 7.1.11, E_ERROR in 7.2.0RC6.
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Edit this bug report at https://bugs.php.net/bug.php?id=75590&edit=1