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OpenGrok - a "wicked fast" source browser!

The following trees are available:

PHP – master branch (github)
PHP – 5.5 (github)
PHP – 5.4 (github)
PHP – 5.3 (github)
PHP – 5.2 (github)
PHP – abandoned unicode tree (github)
PECL (trunk/master branch of most extensions)
Third party libraries (some third party libraries used by PHP)
Other implementations of the PHP language (e.g. HipHop, Phalanger)

The trees are updated hourly, except PECL, which is updated daily.

Reference: OpenGrok Help, Lucene Query Parser Syntax