Mini Shell

<?php
$rootPath = realpath(dirname(__FILE__) . '/..');
require_once $rootPath . '/Portal/config/config.php'; // Use clean config file

session_start();

//require_once 'config/config.php';
 $Grade =  filter_input(INPUT_GET, 'Grade');


    $query = mysqli_query( $conn, "SELECT * FROM student WHERE Level ='$Grade' ORDER BY Level, Full_Name ASC");
       $num = mysqli_num_rows($query);
          
	        if ($num >0){
				
				$delimeter = ",";
                $filename = "Exisiting_Student_List_" . date('d-m-Y:i') . ".csv";
				
								$f = fopen('php://memory', 'w');
				$fields = array('Full_Name', 'Student_No', 'Current_Level');
				fputcsv($f, $fields, $delimeter);

				while ($row = mysqli_fetch_assoc($query)) {
					// Create line data with empty Marks field for user to fill
					$lineData = array($row['Full_Name'], $row['Student_No'],  $row['Level']);
					fputcsv($f, $lineData, $delimeter);
				}
				
				
				
					fseek ($f, 0);
					
					header ('Content-Type: txt/csv');
					header('Content-Disposition: attachment; filename="' .$filename . '";');
						
						fpassthru($f);
						} else {
							
						$_SESSION['failure'] = "Students list not found";
                        header('location: AdminPortal.php');
						}exit;




?>