<configuration xmlns="http://logging.apache.org/log4php/">
    <appender name="default" class="LoggerAppenderMongoDB">
        <param name="host" value="mongodb://example.com" />
        <param name="username" value="logger" />
        <param name="password" value="secret" />
    </appender>
    <root>
        <appender_ref ref="default" />
    </root>
</configuration>

array(
    'appenders' => array(
        'default' => array(
            'class' => 'LoggerAppenderMongoDB',
            'params' => array(
                'host' => 'mongodb://example.com',
                'username' => 'logger',
                'password' => 'secret',
            ),
        ),
    ),
    'rootLogger' => array(
        'appenders' => array('default'),
    ),
);