PHP: 'Time Ago' helper function. Useful for Twitter feeds

gistfile1.txt

//helper function for 'x hours/minutes/seconds ago' - should be passed a time in php time format
function time_elapsed_string($ptime)
{
	$etime = time() - $ptime;

	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';
		}
	}
}