Initial habit tracker project

app/Core/Database.php

@@ -0,0 +1,35 @@
+<?php
+
+use PDO;
+use PDOException;
+
+class Database
+{
+    private static ?PDO $connection = null;
+
+    public static function connection(): PDO
+    {
+        if (self::$connection !== null) {
+            return self::$connection;
+        }
+
+        $db = config('database');
+        $dsn = sprintf(
+            'mysql:host=%s;dbname=%s;charset=%s',
+            $db['host'],
+            $db['dbname'],
+            $db['charset']
+        );
+
+        try {
+            self::$connection = new PDO($dsn, $db['user'], $db['password'], [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+            ]);
+        } catch (PDOException $exception) {
+            throw new PDOException('Datenbankverbindung fehlgeschlagen.');
+        }
+
+        return self::$connection;
+    }
+}

app/Core/View.php

@@ -0,0 +1,15 @@
+<?php
+
+class View
+{
+    public static function render(string $view, array $data = []): void
+    {
+        extract($data, EXTR_SKIP);
+
+        $viewPath = __DIR__ . '/../Views/' . $view . '.php';
+
+        require __DIR__ . '/../Views/layout/header.php';
+        require $viewPath;
+        require __DIR__ . '/../Views/layout/footer.php';
+    }
+}