Php date for tomorrow

hey guys!! i just wanna ask if how am i going to code the date for tomorrow using php?

i have this sample:


 
 
$date_today=date("Y-m-d",mktime(0,0,0,date("m"),date("d"),date("y")));
$date_tomorrow= ??? 
 
 

that is date today how about the date for tomorrow? thanks!!