relative_date

gistfile1.aw

/**
 * Convert to relative date
 *
 * @param int $timestamp In seconds
 * @param array $settings
 * @param string $default_format
 * @return string
 * @version 1.0 (2011-12-12)
 */
function relative_date( $timestamp, array $settings = array(), $default_format = 'Y-m-d' ) {

	# default settings
	# For available keys, see
	# http://www.php.net/manual/en/datetime.formats.relative.php
	$default = array(
		'5 seconds ago' => 'Just now',
		'1 minute ago'	=> 'Less than :seconds seconds ago',
		'1 hour ago'	=> 'Less than :minutes minutes ago',
		'1 day ago'		=> 'Less than :hours hours ago',
		'1 week ago'	=> 'Less than :days days ago',
		'5 seconds'		=> 'Soon',
		'1 minute'		=> ':seconds seconds left',
		'1 hour'		=> ':minutes minutes left',
		'1 day'			=> ':hours hours left',
		'1 week'		=> ':days days left',
	);
	# merge settings
	$settings += $default;

	$offset = $timestamp - time();
	$abs_offset = abs($offset);

	# convert the key, relative format to seconds
	foreach(array_keys($settings) AS $key) {
		$newkey = strtotime($key, 0);
		$settings[$newkey] = $settings[$key];
		unset($settings[$key]);
	}

	# replace :seconds|:minutes|:hours|:days
	foreach($settings AS $time => $value) {
		$settings[$time] = preg_replace_callback('/(:seconds|:minutes|:hours|:days)/', function ($matches) use ($abs_offset) {
			if ($matches[1] == ':seconds') {
				return $abs_offset;
			} elseif ($matches[1] == ':minutes') {
				return ceil($abs_offset / 60);
			} elseif ($matches[1] == ':hours') {
				return ceil($abs_offset / 60 / 60);
			} elseif ($matches[1] == ':days') {
				return ceil($abs_offset / 24 / 60 / 60);
			}
			return $abs_offset;
		}, $value);
	}

	# find suitable text
	$nearest = ($offset > 0) ? PHP_INT_MAX : ~PHP_INT_MAX;
	foreach($settings AS $time => $value) {
		if ($offset > 0) {
			if ($offset < $time && $nearest > $time) {
				$nearest = $time;
			}
		} else {
			if ($offset > $time && $nearest < $time) {
				$nearest = $time;
			}
		}
	}

	return (isset($settings[$nearest])) ? $settings[$nearest] : date($default_format, $timestamp);
}