Convert a timestamp into a relative string e.g. 2 Hours ago

Elapsed time string

<?php

/**
 * Convert a timestamp into a relative string e.g. 2 Hours ago
 *
 * @return string
 *
 * @param $time Timestamp
 **/
function time_elapsed($time)
{
    $etime = time() - $time;

    if ($etime < 1)
    {
        return '0 seconds';
    }

    $a = array(
        12 * 30 * 24 * 60 * 60  =>  'Year',
        30 * 24 * 60 * 60       =>  'Month',
        24 * 60 * 60            =>  'Day',
        60 * 60                 =>  'Hour',
        60                      =>  'Minute',
        1                       =>  'Second',
    );

    foreach ($a as $secs => $str)
    {
        $d = $etime / $secs;
        if ($d >= 1)
        {
            $r = round($d);
            return $r . ' ' . $str . (($r > 1) ? 's ago' : ' ago');
        }
    }
}