Disable WordPress search function

wp-codesnippet-disable-wordpress-search.php

<?php
//add this code into functions.php to disable search

function tt_filter_query( $query, $error = true ) {
	if ( is_search() & !is_admin()) {
		$query->is_search = false;
		$query->query_vars['s'] = false;
		$query->query['s'] = false;
		
		// to error
		if ( $error == true )
			$query->is_404 = true;
	}
}

add_action( 'parse_query', 'tt_filter_query' );
add_filter( 'get_search_form', function($a) {return null;});