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Bug #46984 Strict-Warning when overwriting methods with changed parameters
Submitted: 2008-12-31 12:52 UTC Modified: 2009-02-03 19:53 UTC
Votes:2
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: d_quijote at web dot de Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.3.0alpha3 OS: *
Private report: No CVE-ID: None
View Developer Edit
 [2008-12-31 12:52 UTC] d_quijote at web dot de 
Description:
------------
A Strict-Warning is raised when the parameters of the subclass differ from the parameters of the overwritten superclass method. This error seems only to occure if any interface is included in the superclass

Reproduce code:
---------------
class A implements Iterator {
	public function current() {}
	public function key() {}
	public function next() {}
	public function rewind() {}
	public function valid() {}
	
	public function f($x) {
		echo $x.PHP_EOL;
	}
}

class B extends A {
	public function f($x,$y) {
		echo __METHOD__.'('.$x.', '.$y.')'.PHP_EOL;
	}
}

$b = new B();
$b->f(1,2);

Expected result:
----------------
B::f(1, 2)

Actual result:
--------------
Strict Standards: Declaration of B::f() should be compatible with that of A::f() in /index.php on line 19

Patches

Pull Requests

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 [2009-01-01 00:21 UTC] felipe@php.net 
I agree with you, here is a patch:
http://felipe.ath.cx/diff/bug46984.diff

However it broken some tests, that for me, looks as even they are wrong.
method overloading with different method signature [Zend/tests/objects_002.phpt]
method overloading with different method signature [Zend/tests/objects_003.phpt]
method overloading with different method signature [Zend/tests/objects_004.phpt]
method overloading with different method signature [Zend/tests/objects_005.phpt]
method overloading with different method signature [Zend/tests/objects_006.phpt]
method overloading with different method signature [Zend/tests/objects_007.phpt]
method overloading with different method signature [Zend/tests/objects_008.phpt]
method overloading with different method signature [Zend/tests/objects_009.phpt]

Let's decide the expected behavior, wait...
 [2009-02-03 19:51 UTC] cellog@php.net 
the error occurs regardless of implementing an interface, and is, I believe, correct.  If $y were optional, there is no problem, and no error
 [2009-02-03 19:53 UTC] stas@php.net 
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

Overriding foo($x) with foo($x, $y) - with both parameters required - leads to calls to foo with one argument be wrong for child - thus violating LSP and warranting E_STRICT.
 
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