<?php header( "Content-type: text/plain" );

$arr1 = array(
    'access' => array(
        'axs_import'        => 'administrator',
        'axs_import_users'  => 'test',
        'axs_goaway'        => '',
    ),
    'database' => array(
        'host' => '12.34.56.78',
        'user' => '',
        'name' => '',
    ),
    'import' => array(
        'key'    => '',
        'search' => '',
    ),
);

$arr2 = array(
    'access' => array(
        'axs_import'        => 'administrator',
        'axs_import_users'  => '',
        'axs_settings'      => 'administrator',
        'axs_setings_users' => '',
    ),
    'database' => array(
        'host' => '12.43.21',
        'user' => 'test',
        'pass' => 'new',
        'name' => '',
    ),
    'import' => array(
        'key'    => '',
        'search' => '',
    ),
    'misc' => array(
        'gallery_content' => 500,
    ),
);


$old = _options( $arr1, _options( $arr1, $arr2 ), 'diff' );
$new = _options( $arr2, $arr1 );
$options = array_merge_recursive( $old, $new );

print_r( $options );



function _options( $new, $old, $case = 'compare' )
{

    $diff = array();

    foreach ( $new as $k => $v)
    {

        if ( array_key_exists( $k, $old ) )
        {
            if ( is_array($v) )
            {
                        $rdiff = _options( $v, $old[$k] );

                if ( $case = 'compare' )
                            if ( count($rdiff) ) $diff[$k] = $rdiff;
                else
                            $diff[$k] = array_intersect( $rdiff, $v );

                unset($rdiff);

            }

        }
        else
        {
            $diff[$k] = $v;
        }

    }

    return $diff;
}