dba_exists
(PHP 4, PHP 5, PHP 7, PHP 8)
dba_exists — Check whether key exists
说明
dba_exists(string|array
$key, resource $dba): bool
dba_exists() checks whether the specified
key exists in the database.
参数
-
key -
The key the check is performed for.
-
dba -
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
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User Contributed Notes 1 note
frenzy dot ivan at gmail dot com ¶
13 years ago
<?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);
?>