dba_nextkey

(PHP 4, PHP 5, PHP 7, PHP 8)

dba_nextkeyFetch next key

说明

dba_nextkey(resource $dba): string|false

dba_nextkey() returns the next key of the database and advances the internal key pointer.

参数

dba

The database handler, returned by dba_open() or dba_popen().

返回值

Returns the key on success 或者在失败时返回 false.

参见

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User Contributed Notes 1 note

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phpnet at araxon dot sk
11 months ago
It should be noted that it is not always safe to iterate through the database while changing it at the same time. For example:

<?php
$db
=dba_open(...);

// remove all values shorter than 10 characters
for ($key=dba_firstkey($db); $key!==false; $key=dba_nextkey($db)) {
   
$s=dba_fetch($key, $db);
    if (
strlen($s)<10) {
       
dba_delete($key, $db);
    }
}
?>

The above example will work fine with db4 handler, but not with gdbm. It is handler specific.
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