<link rel="stylesheet" href="/style/themes/<?=(($_COOKIE['USER_DESIGN'] != 'default' and isset($_COOKIE['USER_DESIGN'])) ? $_COOKIE['USER_DESIGN'] : 'default')?>.css" type="text/css"> 
  
 <?php 
  
 if (isset($_GET['edit_themes'])) { 
 $design = trim(htmlspecialchars($_POST['design'])); 
 setcookie('USER_DESIGN', $design, 86400 * 365); 
 exit(header('Location: ?')); 
 } else { 
 echo '<form action="?edit_themes">'; 
 echo '<select name="design" onchange="window.location.href=this.value">'; 
 echo '<option selected disabled> Выберите тему для сайта: </option>'; 
 echo '<option value="blue"> Синий </option>'; 
 echo '<option value="green"> Зелёный </option>'; 
 echo '<option value="red"> Красный </option>'; 
 echo '</select></form>'; 
 }