diff --git a/pub/bin/php/db_connect.php b/pub/bin/php/db_connect.php
index 939be6e..3ce2b84 100644
--- a/pub/bin/php/db_connect.php
+++ b/pub/bin/php/db_connect.php
@@ -1,21 +1,17 @@
 <?php
-/** @var TYPE_NAME $db_server */
-/** @var TYPE_NAME $db_user */
-/** @var TYPE_NAME $db_password */
-/** @var TYPE_NAME $db_database */
-/** @var TYPE_NAME $db_port */
 
-include_once($_SERVER['DOCUMENT_ROOT'] . '/config.php');
-$GLOBALS['conn'] = mysqli_connect($db_server, $db_user, $db_password, $db_database, $db_port);
+require_once "{$_SERVER['DOCUMENT_ROOT']}/config.php";
+
+$GLOBALS['conn'] = mysqli_connect(DB_SERVER, DB_USER, DB_PASSWORD, DB_DB, DB_PORT);
 if (!$GLOBALS['conn']) {
-    echo "Fout bij verbinden met de database" . PHP_EOL;
+    echo "Error connecting to the database." . PHP_EOL;
     die();
 }
 
 try {
-    $dsn = "mysql:host=$db_server;dbname=$db_database;port=$db_port;charset=utf8mb4";
-    $username = $db_user;
-    $password = $db_password;
+    $dsn = "mysql:host=" . DB_SERVER . ";dbname=" . DB_DB . ";port=" . DB_PORT . ";charset=utf8mb4";
+    $username = DB_USER;
+    $password = DB_PASSWORD;
 
     $GLOBALS['pdo'] = new PDO($dsn, $username, $password, [
         PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, // Throw exceptions on errors
@@ -23,6 +19,6 @@ try {
         PDO::ATTR_EMULATE_PREPARES => false,                  // Use real prepared statements
     ]);
 } catch (PDOException $e) {
-    echo "Fout bij verbinden met de database: " . $e->getMessage() . PHP_EOL;
+    echo "Error connecting to the database: " . $e->getMessage() . PHP_EOL;
     die();
 }
\ No newline at end of file
diff --git a/pub/config-sample.php b/pub/config-sample.php
index de58d1a..5667225 100644
--- a/pub/config-sample.php
+++ b/pub/config-sample.php
@@ -5,16 +5,16 @@
  */
 
 # database server name
-$db_server = "localhost";
+define('DB_SERVER', 'localhost');
 
-# database server port (default = 3306)
-$db_port = "3306";
+# database server port
+define('DB_PORT', '3306');
 
 # database name
-$db_database = "sentri";
+define('DB_DB', 'sentri');
 
 # database user
-$db_user = "sentri";
+define('DB_USER', 'sentri');
 
 # Database password
-$db_password = "db-password";
\ No newline at end of file
+define('DB_PASSWORD', 'db-password');
\ No newline at end of file