These functions allow you to store records stored in a dbm-style
database. This type of database (supported by the Berkeley DB,
GDBM, and some system libraries,
as well as a built-in flatfile library) stores key/value pairs
(as opposed to the full-blown records supported by relational
databases).
To use this functions you have to compile PHP with support for an
underlying database. See the
list of supported Databases.
In order to use these functions, you must compile PHP with dbm support
by using the --with-db option. In
addition you must ensure support
for an underlying database or you can use some system libraries.
This extension has no configuration directives defined in php.ini.
The function dbmopen() returns an database identifier
which is used by the other dbm-functions.
This extension has no constants defined.
Example 1. DBM example
<?php
$dbm = dbmopen("lastseen", "w");
if (dbmexists($dbm, $userid)) {
$last_seen = dbmfetch($dbm, $userid);
} else {
dbminsert($dbm, $userid, time());
}
do_stuff();
dbmreplace($dbm, $userid, time());
dbmclose($dbm);
?>
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