PHP DoubleMetaPhone

#
# DESCRIPTION
#
#   This class implements a "sounds like" algorithm developed
#   by Lawrence Philips which he published in the June, 2000 issue
#   of C/C++ Users Journal.  Double Metaphone is an improved
#   version of Philips' original Metaphone algorithm.
#
# COPYRIGHT
#
#   Copyright 2001, Stephen Woodbridge <woodbri@swoodbridge.com>
#   All rights reserved.
#
#   This PHP translation is based heavily on the C implementation
#   by Maurice Aubrey <maurice@hevanet.com>, which in turn
#   is based heavily on the C++ implementation by
#   Lawrence Philips and incorporates several bug fixes courtesy
#   of Kevin Atkinson <kevina@users.sourceforge.net>.
#
#   This module is free software; you may redistribute it and/or
#   modify it under the same terms as Perl itself.
#

Contributions and acknowdgements:

09-Apr-2002: Keith Greene reported a difference in the return codes between DoubleMetaphone and PHP metaphone function with the words "unite" and "ant". I haven't had time to look into this, but I believe this is do to the differences between the DoubleMetaphone algorithm and the metaphone algorithm. So be careful mixing the results between these two.
16-May-2002: Geoff Caplan http://www.advantae.com/ contributed a fix to my original class to return the class object and he created a non-class functional interface which I have included below.
06-Jun-2002: Kevin Emery kemery@mit.edu contributed a port to Progress Software's 4GL. You can get it HERE.
26 May 2010: Moritz Peters added a JavaScript implementation at http://github.com/maritz/js-double-metaphone.

Here are the files:

double_metaphone_func_1-01-alt.php functional interface, updated by Remi Steen (2013) to replace ereg() deprecated in PHP 5.3.0 with preg_match which speeds it up by 10-20%.
double_metaphone_class_1-01.php class file.
double_metaphone_func_1-01.php functional interface.
DoubleMetaPhone.php3 version 1.00 my original class file.

Here is the mptest.php3 test file.

Click HERE to run the interactive test program.

Click HERE to run a batch test of over 1100 names.

Here is the surnames.php3 test program.

Links

To my DoubleMetaPhone Class on the PHP Classes Repository.
To Kevin Atkinson's work at http://aspell.sourceforge.net/metaphone/.
To Maurice Aubrey's work at http://www.cpan.org/modules/by-authors/id/MAURICE/.