DeadForce

It works, thank you very much.

Now I came across another problem, the number of users that $sul_users->get_total() gives varies from page 1 to page 2 which is breaking my pagination.

I’ll try to find a cause but any help is appreciated.

Thanks in advance.

In simple-user-listing.php I added:

$sul_users = new WP_User_Query( $args );
// The authors object.
$users = $sul_users->get_results();

//new filter
$users = apply_filters( 'sul_users_results', $users, $list_id );

//conditional
if ( empty ($users) ) {
$users = $sul_users->get_results();
}

do_action( 'simple_user_listing_before_loop', $list_id );

and in function.php I added this functions

function kia_meta_search( $args ){

  // this $_GET is the name field of the custom input in search-author.php
    $search = ( isset($_GET['as']) ) ? sanitize_text_field($_GET['as']) : false ;

    if ( $search ){
               /* There's a reason we're adding the action from here, you'll see later why. */
    add_action( 'pre_user_query', 'maor_twitter_help_main' );

    /* Create a new WP_User_Query object, limit recordset to 10 */
    $wp_user_search = new WP_User_Query(
        array(
         'number' => 12,
	'role' => 'Author' //I just wanted to check the Authors
        )
    );

    /* Make sure to remove this action since it may affect other user queries around the site. */
    remove_action( 'pre_user_query', 'maor_twitter_help_main' );

    /* Get them users! */
    $users = $wp_user_search->get_results();
    return $users;

    }

}

add_filter('sul_users_results', 'kia_meta_search');

function maor_twitter_help_main( $query ) {
    global $wpdb;
  $search = ( isset($_GET['as']) ) ? sanitize_text_field($_GET['as']) : false ;

    if ( $search ){
    /* The display_name value you're looking to match */
    $display_name = $search;

    /* Search can either be for an exact match or a partial match */
    if ( $use_like_syntax = true ) {
        $query->query_where .= $wpdb->prepare( " AND $wpdb->users.display_name LIKE %s", '%' . like_escape( $display_name ) . '%' );
    } else {
        $query->query_where .= $wpdb->prepare( " AND $wpdb->users.display_name = %s", $display_name );
    }
}
}

I forgot this line of code after the new filter code:

if ( empty ($users) ) {
$users = $sul_users->get_results();
}

if this is not present there would be no results without a search.