(PHP 4 >= 4.0.3, PHP 5 <= 5.0.5)
ovrimos_field_num — Returns the (1-based) index of the output column
ovrimos_field_num() is used to get the (1-based) index of the output column.
ovrimos_field_num() returns the (1-based) index of the output column specified by name, or FALSE.