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 retreived by msql_fetch_field() is retreived.
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().
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