dba_exists
(PHP 4, PHP 5, PHP 7)
dba_exists — Check whether key exists
说明
dba_exists
( string
$key
, resource $handle
) : bool
dba_exists() checks whether the specified
key exists in the database.
参数
-
key -
The key the check is performed for.
-
handle -
The database handler, returned by dba_open() or dba_popen().
返回值
Returns TRUE if the key exists, FALSE otherwise.
参见
- dba_delete() - Delete DBA entry specified by key
- dba_fetch() - Fetch data specified by key
- dba_insert() - Insert entry
- dba_replace() - Replace or insert entry