(PHP 5, PECL OCI8 >= 1.1.0)
oci_field_is_null — Checks if the field is NULL
   Checks if the given field from the 
   statement is NULL. 
  
statementA valid OCI statement identifier.
fieldCan be a field's index or a field's name (uppercased).
   Returns TRUE if field is NULL, FALSE otherwise. 
  
Note:
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.