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Posted by www.douglassdavis.com on 09/17/05 14:48
raf wrote:
> www.douglassdavis.com wrote:
> > All three of the following classes give "compile-time" errors. It
> > hinders me from doing what I want to do... And it seems there is no way
> > around it. But, are each of these cases examples of how the language
> > should behave? Are any of the examples a case of PHP being
> > "incorrect?"
>
> I don't know PHP, but I believe these are bugs in your code:
>
>
> > class MyClass
> > {
> > static $x = 2;
> > static $y = self::$x; // error
> > }
>
> there is no instantiation of the class--there is no "self" object.
> Did you mean "static $y = $x"?
self:: isn't $this-> self:: just refers to the current class, just
like putting the class name there. In PHP, you always have to prefix a
class variable with something, even if you are writing code in that
class.
> > class MyClass2
> > {
> > var $x = 2;
> > static $y = $x; // error
> > }
>
> In this case, since no object was created, there is no $x to assign into
> $y.
>
yes... this one doesn't make sense.
> > class MyClass3
> > {
> > const a = array(1,2); // error
> > }
>
> I defer this to someone who knows PHP, but if its semantics are
> comparable to Java and C#, does "array(1,2)" actually create an instance
> of an array? Based on the pattern of the errors above, I'd suggest you
> review the concepts of object instantiation and class/instance member
> variables.
yes array creates an instance of array.
to the PHP folks out there:
My delima is this... let's say you wanted to do something like this in
a class, and you needed all 3 of these vars to be defined.
class MyClass4
{
var $one = array(1,2);
var $two = array(3,4);
var $three= array($one, $two); // a two dimensional array.
// ... more code below
}
But you knew that these would always remain the same, and there was no
need for putting them in every class. Meaning, if they are not static,
it's just a waste of space.
Also, there are no static initializer blocks like java.
Is there a correct way to define this in the class this without wasting
space?
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