How to disable the search function in WordPress

Disable the search function in WordPress, pure code without plug-ins; Copy and paste the following code into the function.php file.

 function wdp_filter_query( $query, $error = true ) { if ( is_search() ) { $query->is_search = false; $query->query_vars[s] = false; $query->query[s] = false; // to error if ( $error == true ) $query->is_404 = true; } } add_action( 'parse_query', 'wdp_filter_query' ); add_filter( 'get_search_form', create_function( '$a', "return null;" ) );