Update connect.php

PDO Settings via Array: PDO settings are passed as an array directly in the PDO constructor instead of setAttribute. This makes for shorter, cleaner writing.
Exit Function Usage: exit is used instead of die, reflecting a more modern PHP usage.
Default Retrieval Mode: PDO::FETCH_OBJ is set as the default retrieval mode so data will be returned as object. This makes your code a little cleaner and makes data manipulation easier (optional).

controller/connect.php

@@ -1,7 +1,10 @@
 <?php
-try{
-    $db = new PDO("mysql:host=localhost;dbname=rest-api;charset=UTF8","tolga","123456");
-    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
-}catch(PDOException $e){
-    die($e->getMessage());
-}
+try {
+    $db = new PDO("mysql:host=localhost;dbname=rest-api;charset=UTF8", "user", "userpass", [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
+    ]);
+} catch (PDOException $e) {
+    exit($e->getMessage());
+}
+?>