SymfonyWorld Online 2022 Winter Edition

dba_nextkey

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

dba_nextkeyFetch next key

Description

dba_nextkey(resource $dba): string|false

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

Parameters

dba

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

Return Values

Returns the key on success or false on failure.

See Also

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User Contributed Notes 1 note

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phpnet at araxon dot sk
11 days 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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