Xdebug – Professional PHP Debugging

Now lastly, have you ever wished to be able to step through your code, line by line, watch expressions, and even step into a function call to see why it’s producing the wrong return value?

While I don’t agree with running your development server on your Mac instead of using a Vagrant box, this is still a pretty good introduction into a very important debugging tool. Having Xdebug set up correctly can save you a lot of time and headaches, and is an actual good reason for using an IDE.
Of course, after the debugging you can continue as normal in Sublime Text, TextMate, or Vim.

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