Question about functions

[Radon3k]

function myFunction($variable) {
// function code goes in here
}

In the above function entitled, "myFunction", where does $variable get declared? When someone says that it is declared, I assume that it has a $variable = someValue somewhere in the code. However, most of the time I never see this. So where is it declared, or how? I've looked in two of the books I have, but neither have an explanation for my question, they just explain the rest of the function (maybe that means people should automatically know? 😕). I've also looked in the PHP manual. Thanks for any clarification you can give. 🙂

[cgraz]

You declare it when you call your function. Here's an example. Lets say you want to convert a celcius temperature into fahrenheight.

function CtoF($c) {

   $f = $c * (9/5) + 32;
   $f = round($f);
   return $f . "ºF";

}

That's what the function would look like. When you call it, you have to give $c a value. So what you do is call it like this:

CtoF("32");

That will give $c a value of 32 within your function.

Hope this helps.

Cgraz

[Radon3k]

I understand now. This makes a lot of sense. Thasks! 🙂

[cgraz]

There's also a good tutorial here and here

Cgraz

[Radon3k]

Thanks, I'll have a look at these. 🙂