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.
dba_nextkey
(PHP 4, PHP 5, PHP 7, PHP 8)
dba_nextkey — 次のキーを取得する
戻り値
成功した場合にキー、失敗した場合に false を返します。
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phpnet at araxon dot sk ¶
2 years ago
