another way to display your clob details !
$query = "select * from Your_clob_table";
$stmt = OCIParse($conn, $query);
ociexecute($stmt);
while ( OCIFetch($stmt))
{
$lob = OCIResult($stmt,"CLOB_MESSAGE");
$CLOB_MESSAGE = $lob->load();
echo $CLOB_MESSAGE;
}
this works,