PHP Stemmer is a PHP interface to the stemming algorithms from the Snowball project, largely inspired by Richard Boulton's PyStemmer.
It uses FFI (PHP >= 7.4.0) and expects to find the file libstemmer.so (a version of Libstemmer compiled as shared library) in LD_LIBRARY_PATH.
In order to set up this kind of environment you can take a look at docker-php-libstemmer Dockerfile or you can use the corresponding docker image: amaccis/php-libstemmer
PHP Stemmer is available on Packagist, you can install it using Composer.
composer require amaccis/php-stemmer<?php
use Amaccis\Stemmer\Stemmer;
use Amaccis\Stemmer\Enum\CharacterEncodingEnum;
$algorithms = Stemmer::algorithms();
var_dump($algorithms);
/*
array(29) {
[0] =>
string(6) "arabic"
[1] =>
string(8) "armenian"
[2] =>
string(6) "basque"
[3] =>
string(7) "catalan"
[4] =>
string(6) "danish"
[5] =>
string(5) "dutch"
[6] =>
string(7) "english"
[7] =>
string(7) "finnish"
[8] =>
string(6) "french"
[9] =>
string(6) "german"
[10] =>
string(5) "greek"
[11] =>
string(5) "hindi"
[12] =>
string(9) "hungarian"
[13] =>
string(10) "indonesian"
[14] =>
string(5) "irish"
[15] =>
string(7) "italian"
[16] =>
string(10) "lithuanian"
[17] =>
string(6) "nepali"
[18] =>
string(9) "norwegian"
[19] =>
string(6) "porter"
[20] =>
string(10) "portuguese"
[21] =>
string(8) "romanian"
[22] =>
string(7) "russian"
[23] =>
string(7) "serbian"
[24] =>
string(7) "spanish"
[25] =>
string(7) "swedish"
[26] =>
string(5) "tamil"
[27] =>
string(7) "turkish"
[28] =>
string(7) "yiddish"
}
*/
$algorithm = "english";
$word = "cycling";
$stemmer = new Stemmer($algorithm); // default character encoding is UTF-8
$stem = $stemmer->stemWord($word);
var_dump($stem);
/*
string(4) "cycl"
*/
$algorithm = "basque";
$word = "aberatsenetakoa";
$stemmer = new Stemmer($algorithm, CharacterEncodingEnum::ISO_8859_1);
$stem = $stemmer->stemWord($word);
var_dump($stem);
/*
string(8) "aberatse"
*/All files are MIT © Andrea Maccis except for resources/libstemmer.h BSD-3 © Snowball Project.