Question

I’m trying to validate my php form using exception, but somehow it doesn’t work. The exception is supposed to be thrown if the user enters in “nameg” any character which is not string and in the “amountg” anything which is not integer. Should Exceptions even be used in this case:

if(!empty($_POST['nameg']) && !empty($_POST['amountg']))
{
    $user="rootdummy";
    $pass="password";
    $db="practice";
    $nameg=$_POST['nameg'];
    $amountg=$_POST['amountg'];

    try{
        if(!is_int($amountg) || !is_string($nameg)){
            throw new Exception("This is the exception message!");
        }
    }
    catch (Exception $e){
        $e->getMessage();
    }

    mysql_connect('localhost',$user,$pass) or die("Connection Failed!, " . mysql_error());
    $query="INSERT INTO practable (name,given) VALUES('$nameg',$amountg) ON DUPLICATE KEY UPDATE name='$nameg', given=IFNULL(given + $amountg,$amountg)";
    mysql_select_db($db) or die("Couldn't connect to Database, " . mysql_error());
    mysql_query($query) or die("Couldn't execute query! ". mysql_error());

    mysql_close() or die("Couldn't disconnect!");
    include("dbclient.php");
    echo "<p style='font-weight:bold;text-align:center;'>Information Added!</p>";
}

Answer 1

Presumably you want to output the exception? Do:

echo $e->getMessage();

Edit: In response to your later comment regarding script ending, put the MySQL queries in the try block.

Edit 2: Changed validation in response to your comments.

if(!empty($_POST['nameg']) && !empty($_POST['amountg']))
{
    $user="rootdummy";
    $pass="password";
    $db="practice";
    $nameg=$_POST['nameg'];
    $amountg=$_POST['amountg'];

    try{

        if(!ctype_numeric($amountg) || !ctype_alpha($nameg)){
            throw new Exception("This is the exception message!");
        }

      mysql_connect('localhost',$user,$pass) or die("Connection Failed!, " . mysql_error());
      $query="INSERT INTO practable (name,given) VALUES('$nameg',$amountg) ON DUPLICATE KEY UPDATE name='$nameg', given=IFNULL(given + $amountg,$amountg)";
      mysql_select_db($db) or die("Couldn't connect to Database, " . mysql_error());
      mysql_query($query) or die("Couldn't execute query! ". mysql_error());

      mysql_close() or die("Couldn't disconnect!");
      include("dbclient.php");
      echo "<p style='font-weight:bold;text-align:center;'>Information Added!</p>";

    }
    catch (Exception $e){
        echo $e->getMessage();
    }
}