phpDocumentor, sometimes referred to as phpdoc or phpdocu,
is the current standard auto-documentation tool for the php language.
Similar to Javadoc, and written in php,
phpDocumentor can be used from the command line or a web interface
to create professional documentation from php source code.
phpDocumentor 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.