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So in essence we will create a different object for each simple type that we can expect. So I could create a Value object that has the restraint of being non-negative and then use that as the parameter instead.

Aglystas
– Aglystas

2012-09-05 20:04:39 +00:00
Commented Sep 5, 2012 at 20:04
1

Wouldn't it be better to verify that you have the proper parameter types at compile time than at run time? That removes the validation from the function and there is no run-time overhead. I would take Jon's answer one step further and say that you are longing for a type-safe language (e.g. Java). An object-oriented type-safe language lets you define your own types so that you can do Jon's example of Area area(Length w, Length height). Type-safety and OO are wonderful things.

GlenPeterson
– GlenPeterson

2012-09-05 20:41:44 +00:00
Commented Sep 5, 2012 at 20:41
I agree with Glen. Try Java. It isn't bad, really. It may be quite a change from PHP, but better in almost every way.

Zan Lynx
– Zan Lynx

2012-09-05 22:06:34 +00:00
Commented Sep 5, 2012 at 22:06
@GlenPeterson: As a Haskeller, I do prefer static typing. The OP asked about PHP, so I answered from that perspective. PHP has object-oriented features and allows user-defined types. Java is not a credible alternative in this case.

Jon Purdy
– Jon Purdy

2012-09-05 22:06:35 +00:00
Commented Sep 5, 2012 at 22:06
What do you mean when you say, "Java is not a credible alternative in this case?" Do you mean that Java has no good HTML front-end (aka JSP/JSF suck)? Yeah, that's an issue. Also, what is it with this list and Haskell. I hadn't even heard of Haskell until I started hanging out here, and now it seems everyone is into it. It seems a little theoretical to me.

GlenPeterson
– GlenPeterson

2012-09-05 22:29:55 +00:00
Commented Sep 5, 2012 at 22:29

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