Question

I have a PHP based web page. Using Ajax, I call PHP routines. Is it a better practice to keep each routine on its own separate file. Or would it be better to keep them all in one file and the divide the file using a $_GET variable.

Example:
if($_GET['AjaxFunction'] == 1) {
...
} elseif($_GET['AjaxFunction'] == 2) {
...
} elseif($_GET['AjaxFunction'] == 3) {
...
}

Answer 1

If the methods have nothing to do with one another then my vote would be to have a separate file for each one.

If the methods are subtle variations of each other then having one file that then looks at the query string or form post data makes more sense.

Either way it’s quite subjective. This question is similar to “what’s the maximum recommended length of a [file|method|type|whatever]”.