dba_nextkey
(PHP 4, PHP 5, PHP 7, PHP 8)
dba_nextkey — 获取下一个键
返回值
成功时返回键， 或者在失败时返回 false。
更新日志
| 版本 | 说明 |
|---|---|
| 8.4.0 |
dba 参数现在接受 Dba\Connection 实例，
之前接受有效的 dba resource。
|
＋添加备注
用户贡献的备注 1 note
phpnet at araxon dot sk ¶
2 years 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.