Instead of using an editor, you will make life easier and make yourself more productive, if you use an IDE.
Are you still debugging by adding
echo() statements? Instead, use an IDE with a debugger, set breakpoints, examine and set variables, follow the path through your code to see what it does , etc, etc
I highly recommend Eclipse PHP , although Netbeans
is also free and also good, or you could pay for WebStorm OOPS, sorry, I meant to say PHP Storm, which some find better.
While you are at it, check out ChromeLogger , which will let your PHP write to the develop console of your browser (just press F12 to see it). I find this to be extremely useful when developing AJAX. Even for plain PHP, it lets you avoid
Sorry that I did not ask the question which you asked. I just hope that it is the one that you meant to ask ;-)
As to help, they pop up tooltips when you hover over the name of a known function. Maybe not the full help text, but good enough for me.