Disable Search

// Prevent search queries.

add_action(

	'parse_query',

	function ( $query, $error = true ) {

		if ( is_search() && ! is_admin() ) {

			$query->is_search       = false;

			$query->query_vars['s'] = false;

			$query->query['s']      = false;

			if ( true === $error ) {

				$query->is_404 = true;

			}

		}

	},

	15,

	2

);

// Remove the Search Widget.

add_action(

	'widgets_init',

	function () {

		unregister_widget( 'WP_Widget_Search' );

	}

);

// Remove the search form.

add_filter( 'get_search_form', '__return_empty_string', 999 );

// Remove the core search block.

add_action(

	'init',

	function () {

		if ( ! function_exists( 'unregister_block_type' ) || ! class_exists( 'WP_Block_Type_Registry' ) ) {

			return;

		}

		$block = 'core/search';

		if ( WP_Block_Type_Registry::get_instance()->is_registered( $block ) ) {

			unregister_block_type( $block );

		}

	}

);

// Remove admin bar menu search box.

add_action(

	'admin_bar_menu',

	function ( $wp_admin_bar ) {

		$wp_admin_bar->remove_menu( 'search' );

	},

	11

);