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;
     }
}