Description:
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Server: Oracle9i Enterprise Edition Release 9.2.0.7.0
Client: instant client 10.1.0.3

let's suppose we have a table (t) with 3 columns (a, b, c)
and you want to execute the statement:
select a "10", b "20", c "30" from t

if you parse, execute and then get the records like this:
while ($row = oci_fetch_array($statID, OCI_ASSOC)) $data[] = $row;
when you look at $data[0]["10"] there is a value

if you parse, execute and get the records with oci_fetch_all
$data = oci_fetch_all($statID, $data, 0, -1, OCI_FETCHSTATEMENT_BY_ROW)
if you print_r $data it looks the same but you can't access $data[0]["10"] because there is a NULL after the 10 (at least trying and ord looks like)