PHP has nothing to do with it.

Or you can try using css if you know what you’re doing.
References :

…………………..

if you can do math using javascript, then you can use hidden fields to send data to php script ..

i see that you say it is as a blackbox application, i wonder how can send input data to it. but hope you can use my suggestion..

ex: i assume that "F_Total" is input for your blackbox application! ( a post parameter for your application)

<input id="F_Tot" name="F_Total" type="hidden" />

( if you use "name" attribute in your html tag, you can get the value at php script after submit. this works in any server side languages)

do all calculations before you submit,

<script type="text/javascript">
function doyourcalculation(){
var result;
F_Tot = document.getElementById(’F_Tot’); // find hidden field
.
.
.
calculations
result = 3 + 2;
.
.
if (result){ //if result is not nothing
F_Tot.value = result;
return true;
}
else
return false;

};
</script>

use return true or false for validations…
<input type="submit" value="submit" onclick="doyourcalculation()" />

if doyourcalculation has no error and returns true, hidden field has the input for your blackbox application.

good luck..
References :

MySQL is a program, the language is SQL. Figure on a few months, at least, to learn the basics of SQL (the things that 95% of SQL programmers stop at). PHP is trivial once you know programming, you can "learn" it by keeping the php.chm file open as you work. BB code is about as difficult as learning to count to 10.

But learn programming first. If you want to build a house, you don’t learn "hammer", you learn carpentry. Don;t learn the tool (programming languages) until you’ve learned what to use tools for (programming).
References :
30 years of teaching programming

You can learn some of the basics there. You can also check out php.net for more info and user comments.

This probably didn’t help much, but good luck, anyways!
References :

If you see enough examples of good algorithms in those, then you’ll be able to learn how to spot good code in the other books that give coding examples. For object-oriented programming, you ought to see if you can find the solutions manual to a c++ textbook which is called "The C++ Answer Book", because that is nothing BUT code, and it shows a lot of ways of using templates, which you don’t see everywhere.

I’m not suggesting you learn C++. I don’t like either C or it, myself. But you shouldn’t miss out on examining it and knowing exactly how to use it if you are called to do so and can’t refuse.

After you look at those books for a while, choose a language to really get up to speed on in a hurry, and crack the books on it. After you do that, download a free compiler from somewhere that is compatible with it, and try to write up something that uses every kind of algorithm you saw in those data structures and algorithm books.
References :

if(eregi(’.jpg’,$_FILES[image][name]… {

is checking whether the uploaded file is of the type .jpg
Whenever, a file is uploaded, the file info is stored in the $_FILES superglobal. You can access the type of the uploaded file using $_FILES[image][type].

So, in the above mentioned if condition, check what is happening. If it is just checking the file type, you can remove it and your code will allow other file extensions too.

Refer to the following link for more details:
http://www.php.net/manual/en/features.file-upload.php
References :