<?php
Class Helper
{

    public static function ago($time)
    {
        $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
        $lengths = array("60", "60", "24", "7", "4.35", "12", "10");
        $now = time();
        $difference = $now - $time;
        $tense = "ago";
        for ($j = 0; $difference >= $lengths[$j] && $j < count($lengths) - 1; $j++) {
            $difference /= $lengths[$j];
        }
        $difference = round($difference);
        if ($difference != 1) {
            $periods[$j] .= "s";
        }
        return "$difference $periods[$j] ago";
    }

}