PHP undefined index error?

Question

i always get the notice "Undefined index: txtP in D:\WampWorkbench\xampp\htdocs\Test\Login.php on line 15" on the first time i run my site...

Password

$w = $_POST ['txtP'];
echo $w ;
?>

Answer 1

because $w has not been defined until the user inputs the variable value ( the login name )

Answer 2

It's good practice when you assign php variables to make sure they have a value, so that if they don't have a value you can direct people back to the main page with a specific error message or check if a value has been added.

use the isset command, like this:

if (isset($_POST['txtP']){

$w=$_POST['txtP'];

echo $w;

} else {

echo "You need to fill out the form."; //can be any error message.

}

Answer 3

That's error is just general error. It is caused because you have not entered value into the form you made. You can ignore it anyway in development mode. But should turn off the message if you want to deploy your website by inserting this code



error_reporting(E_ALL ^ E_NOTICE); // Report all errors except E_NOTICE



OR



error_reporting(0); // turn off all error messages