<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $courses_json = file_get_contents('data/courses.json');
    $courses = json_decode($courses_json, true);

    $new_course = [
        'name' => $_POST['name'],
        'description' => $_POST['description'],
        'instructor' => $_POST['instructor'],
    ];

    $courses[] = $new_course;

    file_put_contents('data/courses.json', json_encode($courses, JSON_PRETTY_PRINT));

    header('Location: courses.php');
    exit;
}
?>