# dbmnextkey

(PHP 4)

dbmnextkey —

### Description

string dbmnextkey ( resource `$dbm_identifier` , string `$key` )

Returns the next key after `key` .

### Parameters

`dbm_identifier`

  The DBM link identifier, returned by dbmopen().

`key`

  The previous key

### Return Values

The next key if possible

### Examples

By calling dbmfirstkey() followed by successive calls to dbmnextkey() it is possible to visit every key/value pair in the dbm database. For example:

Example#1 Visiting every key/value pair in a DBM database

`<?php
$key = dbmfirstkey($dbm_id);
while ($key) {
echo "$key = " . dbmfetch($dbm_id, $key) . "\n";
$key = dbmnextkey($dbm_id, $key);
}
?>`

### See Also

- dbmfirstkey()