Undefined index: Error in ajax POST and/or php script?

Question

I\'m trying to send an ajax POST to a php file, however the php file sends a notice of \"undefined index\", and the php file never seems to receive the value i\'m trying to

Answer 1

Instead of:

$val = $_POST["vals"];

use this:

if (isset($_POST['vals']) {
    $val = $_POST['vals'];
}