Can one .PHP file edit another?

Question

So I have a file for constants. I want to let user define them and then edit my .php filr with that global constants (not xml - real PHP file )

With such code for exampl

Answer 1

if you are designing your own solution you should refrain from using metaprogramming (check wikipedia) for configuration purposes.

php has a built-in ini-file parser you can use. when you've only got key-value pairs that is sufficient.

writing:

reading:

 $v) {
define($k,$v);
}
?>