Astra_Ext_Advanced_Hooks_Markup::prepare_astra_header_filter( int $post_id, bool $layout )

		private function prepare_astra_header_filter( $post_id, $layout ) {

			$hide_classes = explode( ' ', $this->get_display_device( $post_id, false ) );

			if ( 'footer' === $layout && true === astra_addon_builder_helper()->is_header_footer_builder_active ) {
				add_action( 'astra_footer', array( Astra_Builder_Footer::get_instance(), 'footer_markup' ), 1 );
			}

			if ( ! static::get_time_duration_eligibility( $post_id ) ) {
				return;
			}

			if ( 3 === count( $hide_classes ) ) { // If displayed on desktop, tablet & mobile.

				switch ( $layout ) {
					case 'header':
						remove_action( 'astra_header', 'astra_header_markup' );
						break;
					case 'footer':
						remove_action( 'astra_footer', 'astra_footer_markup' );
						if ( true === astra_addon_builder_helper()->is_header_footer_builder_active ) {
							remove_action( 'astra_footer', array( Astra_Builder_Footer::get_instance(), 'footer_markup' ), 1 );
						}
						break;
					case '404-page':
						remove_action( 'astra_entry_content_404_page', 'astra_entry_content_404_page_template' );
						break;
				}

				return;

			}

			switch ( $layout ) {
				case 'header':
				case 'footer':
					$filter = 'astra_get_' . $layout . '_classes';
					break;
				case '404-page':
					$filter = 'astra_attr_404_page';
					break;
				default:
					$filter = '';
					break;
			}

			if ( $filter ) {
				add_filter(
					$filter,
					function ( $classes ) use ( $hide_classes, $layout ) {
						if ( '404-page' === $layout ) {
							$hide_classes     = implode( ' ', $hide_classes );
							$classes['class'] = isset( $classes['class'] ) ? $classes['class'] . ' ' . $hide_classes : $hide_classes;
							return $classes;
						}
						return array_merge( $classes, $hide_classes );
					}
				);
			}

		}