if ( empty( is_active_sidebar('sideby-post-widget') ) ) {
$class_shop = 'fullw';
}else {
$class_shop = '';
}
?>
Fatal error: Uncaught Error: Call to undefined function is_active_sidebar() in /home/rockyw/domains/rockyweld.com/public_html/index.php:19
Stack trace:
#0 {main}
thrown in /home/rockyw/domains/rockyweld.com/public_html/index.php on line 19