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phpDocumentor is an open source documentation generator written in PHP. It automatically parses PHP source code and produces readable API and source code documentation in a variety of formats. phpDocumentor generates documentation based on PHPDoc-formatted comments and the structure of the source code itself. It supports documentation of both object-oriented and procedural code. phpDocumentor can create documentation in HTML, PDF, CHM or Docbook formats. It can be used from the command line or via a web interface. It has support for linking between documentation, incorporating user level documents like tutorials, and creation of highlighted source code with cross referencing to PHP general documentation. phpDocumentor is able to parse all PHP syntax and supports PHP4 and PHP5. It is an open source project and is distributed under the LGPL Licence.
The latest release has no support for namespaces and other sought after PHP 5.3 features.