Address dynamic class property deprecation warnings

models/User.php

@@ -12,17 +12,20 @@
  */
 abstract class User
 {
-	protected $id_user;
-	protected $first_name;
-	protected $surname;
-	protected $emailaddress;
+	protected int $id_user;
+	protected string $first_name;
+	protected string $surname;
+	protected string $slug;
+	protected string $emailaddress;
+	protected string $password_hash;
 	protected $creation_time;
 	protected $last_action_time;
 	protected $ip_address;
 	protected $is_admin;
+	protected string $reset_key;
 
-	protected $is_logged;
-	protected $is_guest;
+	protected bool $is_logged;
+	protected bool $is_guest;
 
 	/**
 	 * Returns user id.