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Bug #1230 dbmnextkey misbehaves
Submitted: 1999-03-12 16:51 UTC Modified: 1999-03-13 08:31 UTC
From: eric at ipass dot net Assigned:
Status: Closed Package: DBM/DBA related
PHP Version: 3.0.6 OS: Solaris 2.5.1
Private report: No CVE-ID: None
 [1999-03-12 16:51 UTC] eric at ipass dot net
It appears that dbmnextkey returns the next key in a dbm file since the last call to dbmnextkey.  Successive calls to dbmnextkey() using the same key value will return different values.  Unless i'm not reading the docs right, dbmnextkey() should return the key after the key passed to it.  So:

echo dbmnextkey($dbm_id, "mykey") . "\n";
echo dbmnextkey($dbm_id, "mykey") . "\n";
echo dbmnextkey($dbm_id, "mykey") . "\n";

... should always echo the same value.  And:

<?
  $dbm_id = dbmopen("anydbm", "w");
  $firstkey = dbmfirstkey($dbm_id);
  $key = $firstkey;
  while ($key) {
    echo "$key = " . dbmfetch($dbm_id, $key) . "\n";
    $key = dbmnextkey($dbm_id, $firstkey);
  }
?>

... should be an infinite loop.

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 [1999-03-13 08:31 UTC] sas
The exact behaviour depends on the underlying implementation scheme. You are only guaranteed that

$key = dbmfirstkey($id);
while($key) {
	$nextkey = dbmnextkey($id, $key);
	...
	$key = $nextkey;
}

will visit all items in the database.
 
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