$nv_arr = str_split($node_vector, VECTOR_CHARS);
$nv_arr = array_map('intval', $nv_arr);
$node_list = implode(', ', $nv_arr);
$nv_arr = str_split($node_vector, VECTOR_CHARS);
$nv_arr = array_map('intval', $nv_arr);
$node_list = implode(', ', $nv_arr);