Q:

Display recent data after button is clicked(different page)

I have a modal that adds a project to database.
When I clicked the add button I want the recent project data to appear on a pop-up window after the modal has been closed.
I think it is all about the LAST_INSERT_ID() function but it does not work. 
HELP!
Function of my add button:
<?php
if (!empty(isset($_POST["submit_n"]))) {

    $project_name   = $_POST["project_name"];
    $sql = "INSERT INTO tbl_ongoing_project(project_name) VALUES('$project_name')";
    $res = $con->query($sql);
    header("Location: view_result.php");
}
?>

I wanted the header to be like this :view_result.php?id=$id 
$id = last insert id ???

A:

You can write like this,
 $res = $con->query($sql);
 header("Location: view_result.php?id=".$con->insert_id);

It should work, and as a suggestion please use mysqli.

