What is The best way/tool for debuging PHP?

[LEOPARD Corporation <leopardonline.com@xxxxxxxxx>]

Hello,

I'm new to this list, and this is the first time ever I send a message to
you.

I'm learning PHP since a couple of months, and I really wanna be a good PHP
programer, and I know that I should work hard for that.

Now, I just wanted to know what is the best way or tool for debuging PHP.

I have googled for this many many times, and found a lot of these stuff,
but I didn't figure out which one is really the best.

in fact, I don't care whether it's an easy way or hard way, all what I want
is to know what is the best and preferred way or tool.

Wish you all the best!