Used FrontPage for the longest time, and when it was no longer supported, got the next generation: Expression Web.
That only lasted a few years as I kept looking for a more comprehensive tool. I found it when I came across PhpStorm 5 or 6. For me, it is the ultimate tool with support for not just PHP, but JavaScript, CSS and much more.
PhpStorm is intelligent in pointing out errors or issues in code before you even try to run it.
My other tool is Chrome’s DevTools.