Returns an object containing field information
msql_fetch_field() can be used in order to obtain information about fields in a certain query result. If the field offset isn't specified, the next field that wasn't yet retrieved by msql_fetch_field() is retrieved.
The properties of the object are:
name - column name
table - name of the table the column belongs to
not_null - 1 if the column cannot be NULL
primary_key - 1 if the column is a primary key
unique - 1 if the column is a unique key
type - the type of the column
See also msql_field_seek().