Description
string 
dbmnextkey ( resource dbm_identifier, string key )
     Returns the next key after key. 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);
 }
 
 ?>
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