คำนวณ ระยะห่างเวลาว่าห่างกันเท่าไหร่ รบกวนผู้รู้หน่อยครับผม จนปัญญาครับ

$time1 = "2010-07-03 23:30:25";
$time2 = "2010-07-02 00:30:00";

function convert($date){
	$split = explode(" ", $date);
	$group1 = explode("-", $split[0]);
	$group2 = explode(":", $split[1]);
	
	return mktime($group2[0],$group2[1],$group2[2],$group1[1],$group1[2],$group1[0]);
}

function datediff($date1, $date2){
	
	$date = $date1 - $date2;
	
	$curday = floor($date/86400);
	$remain = $date - ($curday * 86400);
	
	$curhr = floor($remain/3600);
	$remain = $remain - ($curhr * 3600);
	
	$curmin = floor($date/60)%60;
	$remain = $remain - ($curmin * 60);
	
	$cursec = $remain%60;
	
	$result = (($curday!=0)?$curday."day ":"").$curhr."hr ".$curmin."min ".$cursec."sec";
	return $result;
}

$time_s = convert($time1);
$time_f = convert($time2);

echo datediff($time_s, $time_f);