Design of a validator class for user registration

Lord_Yggdrasill

Well this thread is not really asking for a complete script from anyone of you, Id love to hear what you'd approach a problem like this one though since I do not have any clues. I have a registration script in which the user enters form fields such as username, password(and reenter the password again in next line), email address, birthday. The Registration validator is supposed to check for user's input and generates error message if one field is entered incorrectly or improperly.

I heard that Observer pattern can be used for validator type classes, I've also found some examples from devshed.com. I do understand how the example works, but still cannot design my own validator class(es) with the techniques posted on devshed.com. Can anyone of you please give me some clues on how I should start to approach this problem and resolve it step by step? Again like I said I wouldnt ask for a complete script, although Id appreciate illustration by a few lines of sample code. Thank you.

Lord Yggdrasill

laserlight

Lord Yggdrasill wrote:
I heard that Observer pattern can be used for validator type classes, I've also found some examples from devshed.com. I do understand how the example works, but still cannot design my own validator class(es) with the techniques posted on devshed.com.

Instead of vaguely referring to "some examples", it would be good to link to them.

NogDog

You might find it useful to see what some of the popular frameworks do for validation, or even take a look at the PEAR::HTML_QuickForm2 (validation section of docs)

Lord_Yggdrasill

laserlight;11006609 wrote:
Instead of vaguely referring to "some examples", it would be good to link to them.

Oh sure thing, here is one of them:
http://www.devshed.com/c/a/PHP/Developing-a-Form-Validation-System-with-the-Observer-Pattern-in-PHP/

NogDog;11006613 wrote:
You might find it useful to see what some of the popular frameworks do for validation, or even take a look at the PEAR::HTML_QuickForm2 (validation section of docs)

I wish I could learn from popular frameworks, but I aint good enough to understand how MVC works at this point. I have learned a few basic design patterns, although I do hope someday I will come to interpret and use MVC in my project. Thanks for the advice though.

Derokorian

I found learning MVC very easy with CodeIgniter (and its video tutorials). Check it out, make something simple and you will get the idea very quickly.