Clean Configuration

function trk_cleancfg( &$config = array() )
{
    $config_temp = $config;
    $config = array();

    foreach( $config_temp as $k => $v )
    {
        if( is_integer( $k ) )
        {
            if( is_array( $v ) )
            {
                foreach( $v as $k2 => $v2 )
                {
                    $config[ $k2 ] = $v2;
                }
            }
            elseif( is_string( $v ) )
            {
                $config[ $v ] = '';
            }
        }
    }

    unset( $config_temp );
}