Basis

exam/config/app.php

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+<?php
+
+return [
+  "basePath" => "phpCourse/exam/",
+];

exam/config/config.php

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+<?php
+
+namespace Config;
+
+class Config
+{
+  private static array $instances = [];
+
+  private array $app;
+  private array $database;
+
+  protected function __construct()
+  {
+    $this->app = require_once __DIR__ . "/app.php";
+    $this->database = require_once __DIR__ . "/database.php";
+  }
+
+  protected function __clone()
+  {
+  }
+
+  public function __wakeup()
+  {
+    throw new \Exception("Cannot unserialize a singleton.");
+  }
+
+  private static function getInstance(): Config
+  {
+    $cls = static::class;
+    if (!isset(self::$instances[$cls])) {
+      self::$instances[$cls] = new static();
+    }
+
+    return self::$instances[$cls];
+  }
+
+  public static function getBasePath()
+  {
+    return Config::getInstance()->app["basePath"];
+  }
+
+  public static function getDatabase()
+  {
+    return Config::getInstance()->database;
+  }
+}

exam/config/database.php

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+<?php
+
+return [
+  "host" => "usersql.zedat.fu-berlin.de",
+  "user" => "khofmann-sql",
+  "passwd" => "xz8c7m7p",
+  "database" => "khofmann-db1",
+  "charset" => "utf8",
+];