PHP时间格式化封装函数

/*格式化时间戳为小时，分钟，秒，几天前等 */
function dgmdate($timestamp, $format = 'dt', $timeoffset = '9999', $uformat = '') {
	global $_G;
	$format == 'u' && !$_G['setting']['dateconvert'] && $format = 'dt';
	static $dformat, $tformat, $dtformat, $offset, $lang;
	if($dformat === null) {
		$dformat = getglobal('setting/dateformat');
		$tformat = getglobal('setting/timeformat');
		$dtformat = $dformat.' '.$tformat;
		$offset = getglobal('member/timeoffset');
		$sysoffset = getglobal('setting/timeoffset');
		$offset = $offset == 9999 ? ($sysoffset ? $sysoffset : 0) : $offset;
		$lang = lang('core', 'date');
	}
	$timeoffset = $timeoffset == 9999 ? $offset : $timeoffset;
	$timestamp += $timeoffset * 3600;
	$format = empty($format) || $format == 'dt' ? $dtformat : ($format == 'd' ? $dformat : ($format == 't' ? $tformat : $format));
	if($format == 'u') {
		$todaytimestamp = TIMESTAMP - (TIMESTAMP + $timeoffset * 3600) % 86400 + $timeoffset * 3600;
		$s = gmdate(!$uformat ? $dtformat : $uformat, $timestamp);
		$time = TIMESTAMP + $timeoffset * 3600 - $timestamp;
		if($timestamp >= $todaytimestamp) {
			if($time > 3600) {
				$return = intval($time / 3600).' '.$lang['hour'].$lang['before'];
			} elseif($time > 1800) {
				$return = $lang['half'].$lang['hour'].$lang['before'];
			} elseif($time > 60) {
				$return = intval($time / 60).' '.$lang['min'].$lang['before'];
			} elseif($time > 0) {
				$return = $time.' '.$lang['sec'].$lang['before'];
			} elseif($time == 0) {
				$return = $lang['now'];
			} else {
				$return = $s;
			}
			if($time >=0 && !defined('IN_MOBILE')) {
				$return = ''.$return.'';
			}
		} elseif(($days = intval(($todaytimestamp - $timestamp) / 86400)) >= 0 && $days < 7) {
			if($days == 0) {
				$return = $lang['yday'].' '.gmdate($tformat, $timestamp);
			} elseif($days == 1) {
				$return = $lang['byday'].' '.gmdate($tformat, $timestamp);
			} else {
				$return = ($days + 1).' '.$lang['day'].$lang['before'];
			}
			if(!defined('IN_MOBILE')) {
				$return = ''.$return.'';
			}
		} else {
			$return = $s;
		}
		return $return;
	} else {
		return gmdate($format, $timestamp);
	}
}