Php Eclipse Development Environment - PDT

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PHP Development Tools (PDT) is an open source development tool that provides you with the basic code editing capabilities you need to get started.

Based on the widely popular Eclipse project and Web Tools Platform, PDT enables you to:

* Edit your PHP source code
* Use code assist, PHP code templates, auto-formatting


It has a debugger with in it called Zend debugger and X debug and a good tool for HTML code problem finding

Here is the download link