Added Docker stuff.

api/DBconnect.php

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: Nermin
+ * Date: 28. 05. 2018
+ * Time: 12:12
+ */
+
+class DBconnect {
+
+    private static $host = getenv('DB_HOST') ?: "localhost";
+    private static $user = getenv('DB_USER') ?: "nermin";
+    private static $password = getenv('DB_PASS') ?: "";
+    private static $schema = getenv('DB_SCHEMA') ?: "dialectsdb";
+    private static $instance = null;
+
+    private function __construct() {
+
+    }
+
+    private function __clone() {
+
+    }
+
+    /**
+     * Returns a PDO instance -- a connection to the database.
+     * The singleton instance assures that there is only one connection active
+     * at once (within the scope of one HTTP request)
+     *
+     * @return PDO instance
+     */
+    public static function getInstance() {
+        if (!self::$instance) {
+            $config = "mysql:host=" . self::$host
+                . ";dbname=" . self::$schema;
+            $options = array(
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_PERSISTENT => true,
+                PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'
+            );
+
+            self::$instance = new PDO($config, self::$user, self::$password, $options);
+        }
+
+        return self::$instance;
+    }
+
+}