Ocilogoff didn't work

[neodix]

Hello
env:Win2000SP2+apache1.3.24+oracle8.1.6+php4.2.0
The problem:
if(!ocilogoff($conn))
{
echo 'logoff error';
}
else
{
echo 'logoff OK';
}

The result always is 'Logoff error';

Does anybody can explain how decide this problem?

[neodix]

i can clarify my problem if it's necessary...