php - How to avoid the error while I haven't click submit -


i have giving declare value going use later on button 

$dstart = $_post["dstart"]; $dend = $_post["dend"];

but when didn't click submit button show me error 

undefined variable: dstart in c:\.....

how can avoid error without using 

error_reporting(0); 

if (isset($_post['dstart'])){   $dstart = $_post['dstart'];   }  if (isset($_post['dend'])){   $dend = $_post['dend'];   }

http://uk1.php.net/isset

with magic of isset

if somewhere using echo $_post['dstart'];
should modify: 

if (isset($_post['dstart'])){ echo $_post['dstart']; }

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