s frontend.
	 *
	 * @return bool
	 */
	private function is_front() {
		return ! is_admin() && ! is_preview();
	}

	/**
	 * Sort admin bar items callback.
	 *
	 * @param array $item1 Item A to compare.
	 * @param array $item2 Item B to compare.
	 *
	 * @return integer
	 */
	private function sort_by_priority( $item1, $item2 ) {
		if ( $item1['priority'] === $item2['priority'] ) {
			return $item1['order'] < $item2['order'] ? -1 : 1;
		}

		return $item1['priority'] < $item2['priority'] ? -1 : 1;
	}

	/**
	 * Get Rank Math icon.
	 *
	 * @param integer $width Width of the icon.
	 *
	 * @return string
	 */
	private function get_icon( $width = 20 ) {
		return '<svg viewBox="0 0 462.03 462.03" xmlns="http://www.w3.org/2000/svg" width="' . $width . '"><g><path d="m462 234.84-76.17 3.43 13.43 21-127 81.18-126-52.93-146.26 60.97 10.14 24.34 136.1-56.71 128.57 54 138.69-88.61 13.43 21z"/><path d="m54.1 312.78 92.18-38.41 4.49 1.89v-54.58h-96.67zm210.9-223.57v235.05l7.26 3 89.43-57.05v-181zm-105.44 190.79 96.67 40.62v-165.19h-96.67z"/></g></svg>';
	}

}