I am currently using this code under version 8:

function fw_fep_add_group_member( $user_id, $group ){
$groups = fep_get_option( ‘gm_groups’, array() );

if( isset($groups[$group]) ){ // Group exists
$members = explode( ‘,’, $groups[$group][‘members’] );
$members[] = $user_id; //user id to add
$groups[ $group ][‘members’] = implode( ‘,’, array_filter( array_unique( $members ) ) );
return fep_update_option(‘gm_groups’, $groups);
}

return;
}

Will this work under version 10? Or has the API changed drastically due to using a table instead of the wp_options table.