WordPress - ascending or alphabetical order search result

WordPress- alphabetical order search result

<?php
/**
 * Ascending order search result - WordPress
 * @param  object $query
 * @return void
 */
function wp20150504_alphabetical_search_query( $query ) {

	//checking whether we are in the search result page or not
    if ( $query->is_search && $query->is_main_query() ) {

    	//setting/forching our desired order parameter o'er the default
        $query->set( 'order', 'ASC' );

    }
}
add_action( 'pre_get_posts', 'wp20150504_alphabetical_search_query' );