diff --git a/cart.php b/cart.php
index 91d8e1b..0d2a284 100644
--- a/cart.php
+++ b/cart.php
@@ -7,7 +7,7 @@
 <?php
   $items = [];
   $total = 0;
-  $cart = array_filter(explode(',', $_COOKIE['cart']));
+  $cart = array_filter(explode(',', getcookie('cart')));
 
   $sql = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
   if (mysqli_connect_errno()) {
@@ -22,7 +22,7 @@
       mysqli_stmt_bind_result($stmt, $name, $slug, $language, $author, $price, $filename);
       mysqli_stmt_fetch($stmt);
       mysqli_stmt_close($stmt);
-    
+
       $booklang = $language == 'en' ? ($eigo ? 'English' : '英語') : ($eigo ? 'Japanese' : '日本語');
 
       if (!isset($items[$c])) $items[$c] = [
diff --git a/include/god.php b/include/god.php
index 271fd7a..7f59520 100644
--- a/include/god.php
+++ b/include/god.php
@@ -3,14 +3,14 @@
   include('helper.php');
 
   if (isset($_POST['langchange'])) {
-    $lang = null !== $_COOKIE['lang'] && $_COOKIE['lang'] == 'en' ? 'ja' : 'en';
+    $lang = null !== getcookie('lang') && getcookie('lang') == 'en' ? 'ja' : 'en';
     setcookie('lang', $lang);
     unset($_POST['langchange']);
     header('Location: /');
   }
 
   if (isset($_POST['addtocart'])) {
-    $cart = null !== $_COOKIE['cart'] ? $_COOKIE['cart'] : '';
+    $cart = null !== getcookie('cart') ? getcookie('cart') : '';
     $cart .= $_POST['item'].',';
     setcookie('cart', $cart);
     unset($_POST['item']);
@@ -19,7 +19,7 @@
   }
 
   if (isset($_POST['cart-minus'])) {
-    $cart = null !== $_COOKIE['cart'] ? $_COOKIE['cart'] : '';
+    $cart = null !== getcookie('cart') ? getcookie('cart') : '';
     $cart = array_filter(explode(',', $cart));
     foreach ($cart as $k => $v) {
       if ($v == $_POST['item']) { unset($cart[$k]); break; }
@@ -33,7 +33,7 @@
   }
 
   if (isset($_POST['cart-plus'])) {
-    $cart = null !== $_COOKIE['cart'] ? $_COOKIE['cart'] : '';
+    $cart = null !== getcookie('cart') ? getcookie('cart') : '';
     $cart .= $_POST['item'].',';
     setcookie('cart', $cart);
     unset($_POST['item']);
@@ -41,7 +41,7 @@
     header('Location: /cart.php');
   }
 
-  $eigo = null !== $_COOKIE['lang'] && $_COOKIE['lang'] == 'en';
-  $cart = null !== $_COOKIE['cart'] && $_COOKIE['cart'] != 0;
+  $eigo = null !== getcookie('lang') && getcookie('lang') == 'en';
+  $cart = null !== getcookie('cart') && getcookie('cart') != 0;
   $styles = ['style'];
 ?>
diff --git a/include/header.php b/include/header.php
index 4a6e8d3..efab79a 100644
--- a/include/header.php
+++ b/include/header.php
@@ -28,7 +28,7 @@
       </form>
       <h2><?php echo $pagetitle; ?></h2>
 
-      <?php $countcart = count(array_filter(explode(',', $_COOKIE['cart']))); ?>
+      <?php $countcart = count(array_filter(explode(',', getcookie('cart')))); ?>
       <div class="nav">
         <ul>
           <li><a href="/"><?php echo $eigo ? 'Home' : 'トップページ'; ?></a></li>