if (dba_exists("key", $id)) { echo dba_fetch("key", $id); dba_delete("key", $id); }
dba_close($id); ?>
DBA is binary safe and does not have any arbitrary limits.
However, it inherits all limits set by the underlying
database implementation.
All file-based databases must provide a way of setting the file
mode of a new created database, if that is possible at all. The
file mode is commonly passed as the fourth argument to
dba_open() or dba_popen().
You can access all entries of a database in a linear way by using the
dba_firstkey() and dba_nextkey()
functions. You may not change the database while traversing it.
Example #2 Traversing a database
<?php
// ...open database...
$key = dba_firstkey($id);
while ($key != false) { if (true) { // remember the key to perform some action later $handle_later[] = $key; } $key = dba_nextkey($id); }
foreach ($handle_later as $val) { dba_delete($val, $id); }
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