dba_exists

(PHP 4, PHP 5)

dba_exists — Check whether key exists

说明

bool dba_exists ( string $key , resource $handle )

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

PHP手册 - N: Check whether key exists

用户评论:

frenzy dot ivan at gmail dot com (27-Nov-2008 01:37)

<?php $index = 4; $id = dba_open("frenzy.db", "w", "flatfile"); if(!$id) exit ("Some error..."); if(dba_exists($index, $id)) exit ("This key is using"); dba_close($id); ?>