Debugging PHP with PDT and XDebug

This post is for PHP developers currently not using a proper PHP debugger.
Installation and configuration of PDT (PHP Development Tools for Eclipse) with the excellent XDebug debugger is discussed in a step-by-step fashion. Please note that my intention is to allow a beginner to get up and running quickly. So my apologies for not discussing all aspect of the procedure in detail. I must also warn you that there could be other (possibly better) ways of getting the same thing done.
සිංහල ලිපියක් ද හැකි ඉක්මනින් පලකරන්නම්.