The metaphone algorithm implemented as a C function in PHP 3.0.14.

This tar file contains the following:

        metaphone.README            - this file.
        metaphone.patch             - a patch file that modifies various
                                      headers, makefiles, and documentation
                                      files.
        doc/function.metaphone.html - documentation file for the metaphone
                                      function
        functions/metaphone.c       - source for the metaphone function.

This code was written to work with version 3.0.14 of PHP.  The installation
instructions are written assuming that you are on a UNIX system.  You will
need to adapt these instructions to your environment.

Installation instructions:

    1.  Move the metaphone.tar.gz file into the php source directory.  If you
        unpacked PHP in /usr/local/src, the source directory will be named
        /usr/local/src/php-3.0.14.

    2.  Unpack the source for metaphone.

                tar xfz metaphone.tar.gz

    3.  Apply the patches

                patch <metaphone.patch

    4.  Configure and build PHP in the normal way.

After PHP is built, you will have a function named metaphone that works the
same way as the soundex function.