$v = $col_cfg['txtrenderer']->call(null, $cl[$col_cfg['dataIndex']], $worksheet, $r+1, $c, $clo);
} else {
$v = call_user_func($col_cfg['txtrenderer'],
$v = $col_cfg['txtrenderer']->call(null, $cl[$col_cfg['dataIndex']], $worksheet, $r+1, $c, $clo);
} else {
$v = call_user_func($col_cfg['txtrenderer'],