Mini Shell

<?php
        session_start();
        if (!isset($_SESSION['teacherID'])) {
            header("Location: login.php");
        }
        
       include '../db/database.php';
        
        $session_teacherID = $_SESSION['teacherID'];
        
        $qry_usersession = "SELECT * FROM teacher AS t1 LEFT JOIN title_name AS t2 ON (t1.titleID = t2.titleID) LEFT JOIN type_personnel AS t3 ON (t1.typeID = t3.typeID) LEFT JOIN tbl_type AS t4 ON (t1.position = t4.type_id) LEFT JOIN tbl_sub_type AS t5 ON (t1.positionManage = t5.sub_type_id) WHERE teacherID='$session_teacherID'";
        $result_usersession = mysqli_query($link,$qry_usersession);
        if ($result_usersession) {
            $row_usersession = mysqli_fetch_array($result_usersession,MYSQLI_ASSOC);
            
            $s_teacherID = $row_usersession['teacherID'];
            $s_username = $row_usersession['username'];
            $s_name = $row_usersession['name'];
            $s_lastName = $row_usersession['lastName'];
            $s_picture = $row_usersession['picture'];
            $s_status_user = $row_usersession['status_user'];
            $s_titleName = $row_usersession['titleName'];
            $s_type_name = $row_usersession['type_name'];
            $s_typePersonnel = $row_usersession['typePersonnel'];
            $s_year = $_SESSION['year'];
            mysqli_free_result($result_usersession);
        }