new folder structure for php scripts

renamed api nodes
php braces on same line

api/src/Database.php

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * Class Database
+ *
+ * Class with all neccessary stuff for the Database connections.
+ */
+class Database {
+    private static ?Database $instance = null;
+    private mysqli $conn;
+
+    private string $servername = "192.168.0.30";
+    private string $username = "root";
+    private string $password = "1qayxsw2";
+    private string $dbname = "mediacenter";
+
+    // The db connection is established in the private constructor.
+    private function __construct() {
+        // Create connection
+        $this->conn = new mysqli($this->servername, $this->username, $this->password, $this->dbname);
+
+        if ($this->conn->connect_errno) {
+            echo "connecton failed... nr: " . $this->conn->connect_errno . " -- " . $this->conn->connect_error;
+        }
+    }
+
+    /**
+     * get an instance of this database class
+     * (only possible way to retrieve an object)
+     *
+     * @return Database dbobject
+     */
+    public static function getInstance() {
+        if (!self::$instance) {
+            self::$instance = new Database();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * get a connection instance of the database
+     *
+     * @return mysqli mysqli instance
+     */
+    public function getConnection() {
+        return $this->conn;
+    }
+
+    /**
+     * get name of current active database
+     * @return string name
+     */
+    public function getDatabaseName() {
+        return $this->dbname;
+    }
+}