I have this project I've inherited, yea I seem to do that a lot, but this damn thing, has to run in php5.4, has deprecated functions for php7 everywhere and a lot of them and there's no classes anywhere beyond some libraries.

Everything is procedural with random scripts being injected left right and center.

I kid you not,

$thisThing = true;
If(x==y)
require "path/to/some/script.php";
else
require "path/to/a/slightly/different/script.php";

If($thisThing === false){
// well it was modified in that small block about 10 different times
}

Those injected scripts then accept data from the parent scope so, looking at file X, you need to have open file A,B, E, and M to understand where variables have been initialised and what there current state could potentially be.

Basically this thing was bandaid after bandaid for feature requests with 0 refactoring.

Here I am trying to implement some basic functionality (should only take an hour or so + a bit of manual testing) but no, I'm literally at the point of hitting the delete button on the entire project and starting again.