(PHP 4, PHP 5, PHP 7)
dba_exists — Check whether key exists
dba_exists ( string $key , resource $handle ) : bool
dba_exists() checks whether the specified key exists in the database.
key
The key the check is performed for.
handle
The database handler, returned by dba_open() or dba_popen().
Returns true if the key exists, false otherwise.
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https://www.php.net/manual/en/function.dba-exists.php