Checks if the given field from the
A valid OCI statement identifier.
Can be a field's index or a field's name (uppercased).
TRUE if field is
In PHP versions before 5.0.0 you must use ocicolumnisnull() instead.
This name still can be used, it was left as alias of
oci_field_is_null() for downwards compatability.
This, however, is deprecated and not recommended.