Code to calculate how many days and hours the PHP time difference is

/**
* Calculate the difference in days and hours
* edit bbs.it-home.org
*/
function DateDiff($startDay,$endDay){
 $start=strtotime($startDay);
 $end=strtotime( $endDay);
 $diff=abs($start-$end);
 $day='';
 $vals=array('day'=>'86400','hour'=>'3600', 'Minutes'=>'60','Seconds'=>'1');
 foreach($vals as $key=>$value){
 if($diff>=$value){
 $d =round($diff/$value);
 $diff%=$value;
 $day.=$d.$key;
 }
 }
 return $day;
}
 //Call example
echo "Programmer's Home, remind you that it is still far from 24:00 on February 1, 2014:"
echo DateDiff(date("Y-m-d H:i:s",mktime()),"2014 -02-01 23:59:59");
?>