oci_field_type_raw() returns Oracle's raw data type of the field.
Note: In PHP versions before 5.0.0 you must use ocicolumntyperaw() instead. This name still can be used, it was left as alias of oci_field_type_raw() for downwards compatability. This, however, is deprecated and not recommended.
However, if you want to get field's type, then oci_field_type() will suit you better. See oci_field_type() for additional information.