NewBatch

<?php
if(isset($_POST['Type']) && $_POST['Type']=="New")
{
    //Create a Database connection
    $servername = "localhost";
    $username = "SOMEUSER";
    $password = "SOMEPASSWORD";
    $dbname = "SOMEDATABASENAME";
    $tbl_name = "Batch";

    //Create connection
    $con = mysqli_connect($servername,$username,$password) or die("Could not connect: " . mysqli_connect_error());

    //Creating request
    $stmt = $con->prepare("INSERT INTO `$dbname`.`$tbl_name` () VALUES ();");
    $stmt->execute();
    $result = mysqli_query($con, "SELECT MAX(Id) AS Id FROM `$dbname`.`$tbl_name`;");
    $row = mysqli_fetch_array($result);
    echo $row['Id'];

    $stmt->close();
    $con->close();
}
?>