oracle + php, empty clob

[almi]

Hi All!

First. I don't speak fluent English. Sorry.

A have to load two CLOB datas from a PL/SQL procedure.
/PROCEDURE PROBAPROC (
xmlid IN NUMBER,
xmldata1 OUT CLOB,
xmldata2 OUT CLOB
)/
And any of Clob's may be empty.

In php, i try to load the clobs like:

<?php
$query = "begin probaproc(1, :clob1, :clob2); end;";

$stmnt = OCIParse($conn, $query);

$clob1 = OCINewDescriptor($conn, OCI_D_LO😎;

$clob2 = OCINewDescriptor($conn, OCI_D_LO😎;

OCIBindByName($stmnt, ':clob1', &$clob1, -1, OCI_B_CLO😎;

OCIBindByName($stmnt, ':clob2', &$clob2, -1, OCI_B_CLO😎;

OCIExecute($stmnt, OCI_DEAFULT);
xmldata1 = $clob1->load();
xmldata2 = $clob2->load();

?>

if the clobs are empty, i get a warning:
OCILobGetLength: OCI_INVALID_HANDLE

Can anybody help me?

Thanks.
almi