Куча мелких фиксов, уборка мусора.

shop.php

@@ -1,14 +1,18 @@
 <?php
 ob_start();
 session_start();
-if ($_SESSION['uid'] == null) header("Location: index.php");
+if ($_SESSION['uid'] == null) {
+    header("Location: index.php");
+    exit;
+}
 require_once 'functions.php';
+$user = $user ?? null;
 
-if ($user['room'] != 22) {
+if ($user->room != 22) {
     header("Location: main.php");
     die();
 }
-if ($user['battle'] != 0) {
+if ($user->battle) {
     header('location: fbattle.php');
     die();
 }
@@ -29,8 +33,8 @@ if ($user['battle'] != 0) {
 
 
 $saleItems = false;
-$shopCategoryType = empty($_POST['sale']) ?: $_POST['sale'];
-$shopCategoryTypeNumber = empty($_GET['otdel']) ?: $_GET['otdel'];
+$shopCategoryType = $_POST['sale'] ?? '';
+$shopCategoryTypeNumber = $_GET['otdel'] ?? 0;
 switch ($shopCategoryTypeNumber) {
     default:
         $shopCategoryType = "Предметы в инвентаре";