Bug #61924 [Opn]: cannot use self in interface function declaration
Edit report at https://bugs.php.net/bug.php?id=61924&edit=1
ID: 61924
Updated by: laruence@php.net
Reported by: jenwelsh at yahoo dot com
Summary: cannot use self in interface function declaration
Status: Open
Type: Bug
Package: Class/Object related
PHP Version: 5.4.1
Block user comment: N
Private report: N
New Comment:
it's always not allowed since php 5.2, why are you thinking it worked once?
Previous Comments:
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[2012-05-03 14:20:54] jenwelsh at yahoo dot com
Description:
------------
I am reviewing existing code on a PHP5.4.1 testbed. I've discovered that interface declarations
using 'self' as a type hint no longer allow implementations to use 'self' but
require them to use the interface name.
It is no longer possible for an interface to declare a method that requires the implementor's
class as a typehint without declaring that class specifically. And that would limit the usefulness
of that interface to one class only.
Test script:
---------------
interface IComparable {
public function equals(self $other);
}
class A implements IComparable{
protected $var;
public function __construct(self $v){
$this->var=$v;
}
public function equals($other){
return ($this->var == $other->var) ? 'equal' : 'different';
}
}
$a1= new A(7);
$a2= new A(5);
$a3= new A(5);
echo $a1->equals($a2),"\n";
echo $a2->equals($a3),"\n";
Expected result:
----------------
different
equal
Actual result:
--------------
PHP Fatal error: Declaration of A::equals() must be compatible with IComparable::equals(IComparable
$other)
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Edit this bug report at https://bugs.php.net/bug.php?id=61924&edit=1
Thread (10 messages)