php存储过程调用不返回输出

Question

I have this weird issue. during this pecific stored procedure call. it does not return any output.

$errorcode = 0;
$errortext = '';
//$purge = false;
$sql = "BEGIN ".DBUSER.".PKGCCPEX.INSERT_POLICIES(:O_ERRORCODE, :O_ERRORTEXT, :I_EXEMPTION_ID, :I_COMMS_MATRIX_ID); END;";
$db_rw->parse($sql);
$result2 =  $db_rw->getStatement();
oci_bind_by_name($result2, ':O_ERRORCODE', $errorcode, 10, SQLT_INT);
oci_bind_by_name($result2, ':O_ERRORTEXT', $errortext, 100, SQLT_CHR);
oci_bind_by_name($result2, ':I_EXEMPTION_ID', $model->fieldVals['ID'], 10, SQLT_INT);
oci_bind_by_name($result2, ':I_COMMS_MATRIX_ID', $model->fieldVals['COMMS_MATRIX_ID'], 10, SQLT_INT);
//oci_bind_by_name($result2, ':I_PURGE', $purge, 1, SQLT_INT);
db_query_execute($result2);

I run the procedure in oracle and it works fine. when i run it via php $errortext is always empty.