public static function stemPhrase($phrase)
{
// split into words
$words = str_word_count(strtolower($phrase), 1);
// ignore stop words
$words = myTools::removeStopWordsFromArray($words);
// stem words
$stemmed_words = array();
foreach ($words as $word) {
// ignore 1 and 2 letter words
if (strlen($word) <= 2) {
continue;
}
// stem word (stemming is specific for each language)
$stemmed_words[] = PorterStemmer::stem($word, true);
}
return $stemmed_words;
}
