Expand all sub-projects from this project.

        $t_projects = user_get_all_accessible_subprojects( $t_user_id, $c_project_id );
        $t_projects[] = $c_project_id;
        $t_projects = array_unique( $t_projects );
        if ( 1 == count( $t_projects ) ) {
            $t_project = $t_projects[0];
            $t_where_prj = "project_id=$t_project AND";
        } else {
            $t_where_prj = "project_id in (". implode( ', ', $t_projects ) . ") AND";
        }</b>
    }