Cookie pelas functions.php

Define a Cookie

/**
 * SAVE COOKIE
 */
add_action( 'init', 'set_view_cookie' );
function set_view_cookie() {
    if (isset($_POST['cookie_view'])) {
        $value = $_POST['cookie_view'];    
        setcookie( 'view_grid_list_cookie', $value, time() + 3600, "/", COOKIE_DOMAIN );
    }
}

Procura a Cookie

<?php 
   if (isset($_POST['cookie_view'])) {
      $_COOKIE['view_grid_list_cookie'] = $_POST['cookie_view']; 
   }
?>