I am trying to submit a form with two conditions regulated by a checkbox. If the second condition is true, I get a warning message--Undefined array key "outside" in C:\xampp\htdocs\Taxi. I tried the following code:
if (isset($_POST['assign'])){
$tid=addslashes($_POST['tid']);
require 'dbconnect.php';
if(addslashes($_POST['outside']))
{
$outside=addslashes($_POST['outside']);
$outinv=addslashes($_POST['inv']);
$sql = "UPDATE trips SET inventory='$outside',cardetails='$inv' WHERE id='$tid'";
$stmt = $con->prepare($sql);
$stmt->execute();
}
else if(!addslashes($_POST['outside'])){
$asn=addslashes($_POST['asn']);
echo $asn;
}
}