Description:
------------
(Actually I'm using 5.2.0 RC6, but it's not in the drop-down list.)

After doing a SELECT from a table that has a CLOB column that contains a NULL, a call to either db2_fetch_array() or db2_fetch_assoc() returns an error.

Reproduce code:
---------------
http://cpe0013102da23b-cm0f0079804905.cpe.net.cable.rogers.com/misc/gallery2/g2_cachemap/g2_cachemap.txt

Run this script twice, first passing arg "odbc" (should run clean), then with arg "ibm_db2" (should fail).

An additional symptom, I don't know if it's the same problem... Uncomment the line that inserts the 'x' then run it again.

ODBC gets:

array(1) {
  ["G_VALUE"]=>
  string(1) "x"
}
array(1) {
  ["G_VALUE"]=>
  NULL
}

ibm_db2 gets:

array(1) {
  [0]=>
  string(1) "x"
}
array(1) {
  [0]=>
  string(1) "x"
}

The ibm_db2 output is again wrong.

Expected result:
----------------
Processing statement "DROP TABLE g2_CacheMap"...
Statement execution succesful.

Processing statement "CREATE TABLE g2_CacheMap (g_value CLOB)"...
Statement execution succesful.

Processing statement "INSERT INTO g2_CacheMap (g_value) VALUES (NULL)"...
Statement execution succesful.

Processing statement "SELECT * FROM g2_CacheMap"...
Statement execution succesful.
array(1) {
  ["G_VALUE"]=>
  NULL
}

Actual result:
--------------
Processing statement "DROP TABLE g2_CacheMap"...
Statement execution succesful.

Processing statement "CREATE TABLE g2_CacheMap (g_value CLOB)"...
Statement execution succesful.

Processing statement "INSERT INTO g2_CacheMap (g_value) VALUES (NULL)"...
Statement execution succesful.

Processing statement "SELECT * FROM g2_CacheMap"...
Statement execution succesful.
PHP Warning:  db2_fetch_array(): Cannot Determine LOB Size in C:\MyServer\gallery2\g2_cachemap.php on line 69

Warning: db2_fetch_array(): Cannot Determine LOB Size in C:\MyServer\gallery2\g2_cachemap.php on line 69