thank you for your advise, it helped a lot!
Now I understand what was wrong with the code, thanks a lot again

if input array is not changed I get the same error
From my point of view, if my script works in a console ,it should work on the site. 1436 other people used some other approach which should not mean that my approach ( again, working properly in console) is a bad one or something
I will try something different
but
Not cool attitude, sir :/