I'm using PHP Designer 2008, it does cost, but it does have a trial on it to evaluate it ^^ I'd really recomment it, even if you just want to evaluate it
Thanks, i did manage to find some editors from http://free-php-editor.com/ but i still think free ones no match for commercial editors. Is there they PHP editor as good as dreamweaver or phpdesigner.
I'am using NuSphere PHP Ed and I can tell you it is great. It is not free, but you can't expect from free software to have everything you need. So if you want to save your nerves, buy some goor PHP editor. My choice was PHP Ed
notepad++ is a good alternative it has code folding and autocomplete (not sure) but its fairly light and easy to get used to
I guess if you are looking to to debug and test your scripts locally you would need a an IDE for php like Zend Core or similar
My favorite is by far Nusphere PhpED which does cost although you can install the trial of phpED and install Devphp. when you use Dev php have everything read from nusphere phped and you will get the debugger, php interpreter, etc. by using Dev PHP. Basically its a way to use all of the functions of Nusphere's phpED without paying for it. If you do use this work around I would still have to say if and when you have the money pay for Nusphere's instead of using it in this way.
Don't laught, but i use notepad often, because sometimes i need to make really small changes, it opens .php files very fast, saves my time, since to load dreamweaver takes some time on my pc.