Re: php 5 classes: public, protected and private

jopperdepopper wrote:
Look for some good books on OO theory and design.



Thanks Jerry, maybe the php 5 approach is a better implementation than
the php 4 approach? I have always felt that in php 4 using classes (or
at least my way of using them) was more a convenient way to organise
code, grouping some related functions in one class, other related ones
in another...

Gotta get me some books & hope it's going to be a loooong coooold
winter ;)


Yes, I think it is - but then I've been doing OO programming for a number of years, both in C++ and Java.

Classes are a good way to organize code - but more importantly, they are a way of organizing code AND DATA. A properly constructed class should, as much as possible, manage it's own data independent of other classes and code.

It's a whole different way of thinking which is usually quite a jump for experienced programmers. In fact, I find newer programmers typically have less problems, because structured code techniques are not so deeply ingrained in their mind. :-)

But it's well worth it; the resulting code can be much more readable and maintainable.

A good example. I needed to implement some pages based on a database. However, the particular host being used at the time did not have MySQL available (they claimed they did, but it wasn't very reliable...).

So I implemented the code in flat files using a class for the data being displayed, and pages to use that class. Later, when they changed to a host which had MySQL, all I had to do was go back to the class and change it to read from a database instead of a flat file. No changes to the pages were needed at all. Very clean and easy to do, because I segregated the operations on the data in the class, and used the web page code just to display the data.


--
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Jerry Stuckle
JDS Computer Training Corp.
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