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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
5 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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