OK, the question is simple though I can't find a real working solution.
I want to be able to define something while invoking a specific script.
I have tried it like php -d DEBUG_ON myscript.php but it's not working (when testing if (defined("DEBUG_ON")) { } inside the script, it returns false)
Also tried something along the lines of php -r ('define("DEBUG_ON",1);') myscript.php; which doesn't work either.
So, any ideas? (Or any suggestions on how I could achieve the very same effect?)