Zend debugger is basically the server side component that is used by Zend Studio. You need this to do your remote debugging!!
Normally you’d find this included in an installation of Zend Core or Zend Platform. However we aren’t using Zend’s apache php bundle so this little gem has to be loaded…
It’s hard to find on the net and not well advertised – I imagine because of Zend’s preference that you’d start using Zend Core.. Which looks great mind you but is missing some vital extensions some of our projects are using..
http://downloads.zend.com/pdt/server-debugger/
[...] Zend Studio – My preferred PHP Integrated Development Environment (IDE)! It comes in two flavours at the moment the original one which is awesome and the new one based on the Eclipse platform (Zend Studio for Eclipse) which should be even better ( a work in progress). Run with Zend Core/Zend Platform it offers step-through code debugging. Without this you’ll need to setup the largely undocumented Zend Debugger. [...]