dba_exists

Check whether key exists

&reftitle.description; `bool` `dba_exists` ``string``array```key` `resource` `dba`

`dba_exists` checks whether the specified `key` exists in the database.

&reftitle.parameters;

`key`

- The key the check is performed for.

`dba`

- The database handler, returned by `dba_open` or `dba_popen`.

&reftitle.returnvalues;

Returns &true; if the key exists, &false; otherwise.

&reftitle.seealso;

- `dba_delete`
- `dba_fetch`
- `dba_insert`
- `dba_replace`