Alternatives by computing the levenshtein distance in symfony

symfony_levenshtein.php

<?php
$lev = levenshtein($subname, $parts[$i]);
if ($lev <= \strlen($subname) / 3 || '' !== $subname && false !== strpos($parts[$i], $subname)) {
    $alternatives[$collectionName] = $exists ? $alternatives[$collectionName] + $lev : $lev;
} elseif ($exists) {
    $alternatives[$collectionName] += $threshold;
}