Req #54003 [Com]: re-enable abstract static methods
Edit report at https://bugs.php.net/bug.php?id=54003&edit=1
ID: 54003
Comment by: dagguh at gmail dot com
Reported by: giorgio dot liscio at email dot it
Summary: re-enable abstract static methods
Status: Open
Type: Feature/Change Request
Package: Class/Object related
PHP Version: 5.3.5
Block user comment: N
Private report: N
New Comment:
1. Don't use LSB next time.
2. Use normal inheritance instead.
3. WONTFIX
Previous Comments:
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[2012-03-06 04:19:14] cgili at yahoo dot com
Inheritance and method override is something really important on PHP, it's important to
redefine not only the methods but also the parameters they take, for instance, you have a class
Rectangle with a method called Area that calculates the area in m2 by requiring the height and
width, now you want to create a Cube class extending the Rectangle class, and override the function
Area to calculate the area in cubic meters, the formula is different and the parameters are 3,
height, width and deep. It's the very "BASIC" definition of Class inheritance and
Method Overriding.
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[2011-02-13 00:14:32] giorgio dot liscio at email dot it
Description:
------------
hi, please read carefully my request before trash this
since static inheritance is now implemented in php, enabling this again can provide an awesome
natural feature of the language
I talked with some php hackers, and they agree with me, but in past, I did not have good news about
this:
I'm sure my example makes totally sense, and this should stay disabled only if there are
technical limitations that do not matter with the good logic of my example
in practice, I can understand WONT FIX, but not BOGUS
abstract class AFileSystemItem
{
public static function getIfValid ($fullPath)
{
// i use static::isValid to get the method defined in the called class
if(static::isValid($fullPath)) return new static($fullPath);
}
protected function __construct ($fp){}
// i want to force real classes to implement a way to check a path before instance an object
protected abstract static function isValid ($fullPath); // abstract declaration
}
class Dir extends AFileSystemItem
{
protected static function isValid ($fullPath) // implementation
{
return is_dir($fullPath);
}
}
class File extends AFileSystemItem
{
protected static function isValid ($fullPath) // implementation
{
return is_file($fullPath);
}
}
class Image extends File
{
protected static function isValid ($fullPath) // implementation with override
{
if(parent::isValid($fullPath) AND (bool)getimagesize($fullPath)) return true; return false;
}
}
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