The swish extension provides the bindings for Swish-e API.
Swish-e stands for "Simple Web Indexing System for Humans - Enhanced" and
is an open source system for indexing and search.
Swish-e itself is licensed under GPL license, but uses a clause that
allows applications to link against the library if every copy of the
combined work is accompanied by the URL to Swish-e source code. Here it
is: » http://swish-e.org.
This extension is
EXPERIMENTAL. The behaviour of this extension—including
the names of its functions and any other documentation surrounding this
extension—may change without notice in a future release of PHP.
This extension should be used at your own risk.