Initial version

.gitignore

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+node_modules/
+*/node_modules/
+*/build/

.htaccess

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+DirectoryIndex index.php index.html
+Options -Indexes
+Options -MultiViews
+
+RewriteEngine On
+
+# 0) Serve existing files/directories as-is
+RewriteCond %{REQUEST_FILENAME} -f [OR]
+RewriteCond %{REQUEST_FILENAME} -d
+RewriteRule ^ - [L]
+
+# 1) Internal map: /page or /page/ -> /page.php (if such PHP file exists)
+RewriteCond %{REQUEST_FILENAME}.php -f
+RewriteRule ^(.+?)/?$ $1.php [L]
+
+# 2) Optional: strip trailing slash for non-directories (keeps .php links working)
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteRule ^(.+)/$ $1 [R=301,L]

db/config.php

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+<?php
+// Generated by setup_mariadb_project.sh — edit as needed.
+define('DB_HOST', '127.0.0.1');
+define('DB_NAME', 'app_33890');
+define('DB_USER', 'app_33890');
+define('DB_PASS', '400e495e-0bbc-447f-b58a-12e9808e995a');
+
+function db() {
+  static $pdo;
+  if (!$pdo) {
+    $pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4', DB_USER, DB_PASS, [
+      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    ]);
+  }
+  return $pdo;
+}

db/migrate.php

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+<?php
+require_once __DIR__ . '/config.php';
+
+function run_migrations() {
+    $pdo = db();
+
+    // 1. Create migrations table if it doesn't exist
+    $pdo->exec("CREATE TABLE IF NOT EXISTS `migrations` (
+        `id` INT AUTO_INCREMENT PRIMARY KEY,
+        `migration_file` VARCHAR(255) NOT NULL UNIQUE,
+        `applied_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
+
+    // 2. Get all migration files
+    $migration_files = glob(__DIR__ . '/migrations/*.sql');
+
+    // 3. Get already applied migrations
+    $stmt = $pdo->query("SELECT `migration_file` FROM `migrations`");
+    $applied_migrations = $stmt->fetchAll(PDO::FETCH_COLUMN);
+
+    echo "Starting migrations...\n";
+
+    // 4. Apply pending migrations
+    foreach ($migration_files as $file) {
+        $filename = basename($file);
+        if (!in_array($filename, $applied_migrations)) {
+            echo "Applying migration: {$filename}...\n";
+            
+            // Execute the SQL file
+            $sql = file_get_contents($file);
+            $pdo->exec($sql);
+
+            // Record the migration
+            $stmt = $pdo->prepare("INSERT INTO `migrations` (`migration_file`) VALUES (?)");
+            $stmt->execute([$filename]);
+
+            echo "  ...applied successfully.\n";
+        } else {
+            echo "Migration already applied: {$filename}\n";
+        }
+    }
+
+    echo "Migrations finished.\n";
+}
+
+// Run migrations if the script is executed directly
+if (php_sapi_name() === 'cli' && basename(__FILE__) == basename($_SERVER['PHP_SELF'])) {
+    run_migrations();
+}

db/migrations/001_initial_schema.sql

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+-- 001_initial_schema.sql
+
+-- Table for user roles
+CREATE TABLE IF NOT EXISTS `roles` (
+  `role_id` INT AUTO_INCREMENT PRIMARY KEY,
+  `role_name` VARCHAR(50) NOT NULL UNIQUE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Insert default roles
+INSERT IGNORE INTO `roles` (`role_name`) VALUES ('student'), ('instructor'), ('admin');
+
+-- Table for users
+CREATE TABLE IF NOT EXISTS `users` (
+  `user_id` INT AUTO_INCREMENT PRIMARY KEY,
+  `username` VARCHAR(255) NOT NULL UNIQUE,
+  `password_hash` VARCHAR(255) NOT NULL,
+  `email` VARCHAR(255) NOT NULL UNIQUE,
+  `role_id` INT,
+  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (`role_id`) REFERENCES `roles`(`role_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Table for courses
+CREATE TABLE IF NOT EXISTS `courses` (
+  `course_id` INT AUTO_INCREMENT PRIMARY KEY,
+  `title` VARCHAR(255) NOT NULL,
+  `description` TEXT,
+  `instructor_id` INT,
+  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (`instructor_id`) REFERENCES `users`(`user_id`) ON DELETE SET NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Table for enrollments
+CREATE TABLE IF NOT EXISTS `enrollments` (
+  `enrollment_id` INT AUTO_INCREMENT PRIMARY KEY,
+  `student_id` INT,
+  `course_id` INT,
+  `enrollment_date` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (`student_id`) REFERENCES `users`(`user_id`) ON DELETE CASCADE,
+  FOREIGN KEY (`course_id`) REFERENCES `courses`(`course_id`) ON DELETE CASCADE,
+  UNIQUE KEY `student_course_unique` (`student_id`, `course_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Table for discussion posts
+CREATE TABLE IF NOT EXISTS `discussion_posts` (
+    `post_id` INT AUTO_INCREMENT PRIMARY KEY,
+    `course_id` INT NOT NULL,
+    `user_id` INT NOT NULL,
+    `parent_post_id` INT NULL,
+    `post_content` TEXT NOT NULL,
+    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (`course_id`) REFERENCES `courses`(`course_id`) ON DELETE CASCADE,
+    FOREIGN KEY (`user_id`) REFERENCES `users`(`user_id`) ON DELETE CASCADE,
+    FOREIGN KEY (`parent_post_id`) REFERENCES `discussion_posts`(`post_id`) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Table for grades
+CREATE TABLE IF NOT EXISTS `grades` (
+    `grade_id` INT AUTO_INCREMENT PRIMARY KEY,
+    `enrollment_id` INT NOT NULL,
+    `grade` DECIMAL(5, 2) NOT NULL,
+    `comments` TEXT,
+    `assessment_date` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (`enrollment_id`) REFERENCES `enrollments`(`enrollment_id`) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

index.php

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+<?php
+require_once 'includes/header.php';
+
+// Redirect to login page if user is not logged in
+if (!isset($_SESSION['user_id'])) {
+    header('Location: login.php');
+    exit;
+}
+?>
+
+<h1>Welcome to your Learning Dashboard</h1>
+<p>This is your central hub for managing your educational experience.</p>
+
+<?php
+// Example of showing different content based on role
+$role = '';
+try {
+    $stmt = db()->prepare("SELECT r.role_name FROM users u JOIN roles r ON u.role_id = r.role_id WHERE u.user_id = ?");
+    $stmt->execute([$_SESSION['user_id']]);
+    $role = $stmt->fetchColumn();
+} catch (PDOException $e) {
+    echo "<p style='color:red'>Could not determine user role.</p>";
+}
+
+if ($role === 'admin') {
+    echo '<p>As an administrator, you can manage all aspects of the platform from the <a href="admin.php">Admin Dashboard</a>.</p>';
+} elseif ($role === 'instructor') {
+    echo '<p>As an instructor, you can manage your <a href="courses.php">courses</a> and students.</p>';
+} else {
+    echo '<p>As a student, you can view your enrolled <a href="courses.php">courses</a> and track your progress.</p>';
+}
+?>
+
+<?php require_once 'includes/footer.php'; ?>