Add files via upload

db.php

@@ -0,0 +1,16 @@
+<?php
+function getDbConnection(): PDO
+{
+    $host = getenv('DB_HOST') ?: 'mysql';
+    $db   = getenv('DB_NAME') ?: 'crm';
+    $user = getenv('DB_USER') ?: 'crm_user';
+    $pass = getenv('DB_PASS') ?: '';
+
+    $dsn = "mysql:host=$host;dbname=$db;charset=utf8mb4";
+    $options = [
+        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    ];
+
+    return new PDO($dsn, $user, $pass, $options);
+}