dba_firstkey() returns the first key of the database specified by handle and resets the internal key pointer. This permits a linear search through the whole database.
Handle is a database handle returned by dba_open().
dba_firstkey() returns the key or FALSE depending on whether it succeeds or fails, respectively.
See also: dba_firstkey(), dba_key_split() and example 2 in the DBA examples
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