Mini Kabibi Habibi

<?php
session_start();
$con = mysqli_connect("localhost","root","","personnel");

if(isset($_POST['save_multiple_data']))
{   
     $username = $_POST['username'];
    $from_date = $_POST['from_date'];
    $to_date = $_POST['to_date'];
    $post_title = $_POST['post_title'];
    $dept = $_POST['dept'];
    $month_sal = $_POST['month_sal'];
    $sal_grade = $_POST['sal_grade'];
    $stats_appoint = $_POST['stats_appoint'];
    $gov_service = $_POST['gov_service'];
   
    foreach($username as $index => $usernames)
    {   
        $s_username = $usernames;
        $s_from_date = $from_date[$index];
        $s_to_date = $to_date[$index];
        $s_post_title = $post_title[$index];
         $s_dept = $dept[$index];
          $s_month_sal = $month_sal[$index];
         $s_sal_grade = $sal_grade[$index];
         $s_stats_appoint = $stats_appoint[$index];
         $s_gov_service = $gov_service[$index];
        // $s_otherfiled = $empid[$index];

        $query = "INSERT INTO work_experience (username,from_date,to_date,post_title,dept,month_sal,sal_grade,stats_appoint,gov_service) VALUES ('$s_username','$s_from_date','$s_to_date','$s_post_title','$s_dept','$s_month_sal','$s_sal_grade','$s_stats_appoint','$s_gov_service')";
        $query_run = mysqli_query($con, $query);
    }

    if($query_run)
    {
        $_SESSION['status'] = "Multiple Data Inserted Successfully";
        header("Location: expi.php.php");
        exit(0);
    }
    else
    {
        $_SESSION['status'] = "Data Not Inserted";
        header("Location: work_expi.php");
        exit(0);
    }
}
?>