Snippet Units for multiple declinations

units.snippet.php

<?php
$forms = explode(',', $scriptProperties['forms']);
$n = $scriptProperties['count'];

if (count($forms) < 3) return;
 
if (($n % 10 == 1) && ($n % 100 != 11)) {
    $return = $forms[0];
} elseif (($n % 10 >= 2) && ($n %10 <= 4)  && ($n % 100 < 10 || $n % 100 >= 20)) {
    $return = $forms[1];
} else {
    $return = $forms[2];
}
 
return trim($return);