MODX output filter to convert months to years

months2years.php

<?php
$years = floor($input/12);
$months = $input%12;
$yearsDisplay = $years.($years > 1 ? ' years' : ' year');
        if($years == 0) {
            $yearsDisplay = '';
        }

$monthsDisplay = $months.($months > 1 ? ' months' : ' month');
        if($months == 0) {
            $monthsDisplay = '';
        }

$output = $yearsDisplay . ($years > 0 && $months > 0 ? ', ' : ' ') . $monthsDisplay;
return $output;