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<?php // First we execute our common code to connection to the database and start the session require("common.php"); // At the top of the page we check to see whether the user is logged in or not if(empty($_SESSION['user'])) { // If they are not, we redirect them to the login page. header("Location: login.php"); // Remember that this die statement is absolutely critical. Without it, // people can view your members-only content without logging in. die("Redirecting to login.php"); } // Everything below this point in the file is secured by the login system // We can display the user's username to them by reading it from the session array. Remember that because // a username is user submitted content we must use htmlentities on it before displaying it to the user. ?> <?php require_once './config/config.php'; if ($_SERVER['REQUEST_METHOD'] == 'POST') { $name=$_POST["Class1"]; //mysqli_query($db,'INSERT INTO `class` (`Name`) VALUES ($name)'); $sql=mysqli_query($con,"select * from class where Name = '$name' "); $sql1=mysqli_num_rows($sql); if($sql1 != 0) { ?> <script> document.location="Class.php"; alert("Duplicate Entry"); </script> <?php }else { mysqli_query($con,"insert into class (`Name`) values ('$name')")or die(mysqli_error($con)); ?> <script> alert("Entry Successfull"); document.location="Class.php"; </script> <?php } }else{ header('location: index.php'); } ?>