oci_cancel() invalidates a cursor, freeing all associated resources and cancels the ability to read from it.
Palauttaa TRUE onnistuessaan, muutoin FALSE.
In PHP versions before 5.0.0 you must use ocicancel() instead. This name still can be used, it was left as alias of oci_cancel() for downwards compatability. This, however, is deprecated and not recommended.