Redirects search results from /?s=query to /your-keyword/query/

nice-search

/**
 * Redirects search results from /?s=query to /search/query/, converts %20 to +
 *
 * @link https://wordpress.org/plugins/nice-search/
 * 
 */
add_action( 'template_redirect', function () {
	global $wp_rewrite;
	if ( !isset( $wp_rewrite ) || !is_object( $wp_rewrite ) || !$wp_rewrite->using_permalinks() )
		return;

        $search_base = $wp_rewrite->search_base;
	if ( is_search() && !is_admin() && strpos( $_SERVER['REQUEST_URI'], "/{$search_base}/" ) === false ) {
		wp_redirect( home_url( "/{$search_base}/" . urlencode( get_query_var( 's' ) ) ) );
		exit();
	}
});

/**
 * Changhe the search_base add rewrite_rule
 * Only if != search
 */
add_action( 'init', function () {
    
    $GLOBALS['wp_rewrite']->search_base = 'search-results';
    add_rewrite_rule('^' . $GLOBALS['wp_rewrite']->search_base . '/([^/]+)/?$', 'index.php?s=$matches[1]', "top");
    
});