(PHP 3>= 3.0.8, PHP 4 )
dba_exists() checks whether the specified key exists in the database specified by handle.
Key is the key the check is performed for.
Handle is a database handle returned by dba_open().
dba_exists() returns TRUE or FALSE, if the key is found or not found, respectively.
See also: dba_fetch(), dba_delete(), dba_insert(), and dba_replace().
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