Delete data in database File in PHP

 <?php

include("dbconn.php");

if (isset($_GET["id"])) {

    $idnew = $_GET["id"];

}

$sql = "DELETE FROM students WHERE id = '$idnew'";

if ($conn->query($sql) == TRUE) {

    header("location:index.php?delete_msg=YOU HAVE SUCCESSFULLY DELETED DATA");

} else {

    die("Query Failed : " . $conn->error);

    echo "Error : " . $sql . "<br>" . $conn->error;

}

$conn->close();