post crud

app/services/UserService.php

@@ -2,6 +2,7 @@
 
 namespace app\services;
 
+use app\helpers\Debug;
 use app\models\User;
 use kernel\FormModel;
 
@@ -33,4 +34,13 @@ class UserService
         return false;
     }
 
+    public function check(string $username): bool
+    {
+        if (User::where(['username' => $username])->first())
+        {
+            return true;
+        }
+        return false;
+    }
+
 }