mysql_fetch_field(result,[offset])
Description: Gets column information from a result given by result and returns as an object.
Returns information about the fields in a query result. The integer offset is used to specify the field, but if not specified, information is returned about the next field that has not already been reported on by mysql_fetch_field().
The object returned has the following properties:
name— The column name
table— The name of the table to which the column belongs
not_null— Set to 1 if the column is NOT NULL
primary_key— Set to 1 if the column is the primary key
unique_key— Set to 1 if the column is a unique key
multiple_key— Set to 1 if the column is a non-unique key
numeric— Set to 1 if the column is a numeric type
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