How to Disable Search on WordPress

This is to disable search function in your website and redirect to homepage and 404 Page.

Copy and paste the following code in the functions.php of our current theme.

<?php
//disable search on browser
function wpb_filter_query( $query, $error = true ) {
if ( is_search() ) {
$query->is_search = false;
$query->query_vars['s'] = false;
$query->query['s'] = false;
if ( $error == true )
$query->is_404 = true;
}
}
add_action( 'parse_query', 'wpb_filter_query' );
add_filter( 'get_search_form', function( $a ){return $a;});

//unregister search widget
function remove_search_widget() {
	unregister_widget('WP_Widget_Search');
}
add_action( 'widgets_init', 'remove_search_widget' );