<?php

function pluralise($count, $single, $plural = null) {
	if ($count == 1 || $count == -1)  {
		return $single;
	}
	if ($plural == null) {
		$plural = $single . 's';
	}
	return $plural;
}

function from_time($time) {
	$now = new DateTime('now');
	$then = new DateTime($time);
	$timespan = $now->diff($then);
	$message = array();
	if ($timespan->y)
		$message[] = $timespan->y.' '.pluralise($timespan->y, 'year');
	if ($timespan->m)
		$message[] = $timespan->m.' '.pluralise($timespan->m, 'month');
	if ($timespan->d)
		$message[] = $timespan->d.' '.pluralise($timespan->d, 'day');
	if ($timespan->h)
		$message[] = $timespan->h.' '.pluralise($timespan->h, 'hour');
	if ($timespan->i)
		$message[] = $timespan->i.' '.pluralise($timespan->i, 'minute');
	if ($timespan->s)
		$message[] = $timespan->s.' '.pluralise($timespan->s, 'second');
	if (count($message) == 0) {
		return 'just now';
	}
	$output = array_shift($message);
	if ($message) {
		$output .= ' and '.array_shift($message);
	}
	$output .= ' ago';
	return $output;
}