unchecked checkbx brings error

[flemingmike]

hi, i am showing an error when i submit a form and a checkbox is not checked.  here is the line that is giving me the error.  any fix for this?

 

Error

Notice: Undefined index: billable in E:\Website\portal\mobile\editreport.php on line 14

 

Code

if($_POST['billable'] == "ON") {
 $pbillable = "1";
 } else {
 $pbillable = "2";
 }

 

Even though i am getting an error, it still updates my database with a number 2.

[Pikachu2000]

isset

[coupe-r]

Pikachu is correct.

 

if(isset($_POST['billable'] ))
{
    $pbillable = "1";
}
    else
    {
         $pbillable = "2";
    }