class RegisteredSettingsTest {
    private $page;
    private $name = 'test-option';
    private $options;
    function __construct() {
        add_action( 'admin_init', array( $this, 'admin_init' ) );
        add_action( 'admin_menu', array( $this, 'admin_menu' ) );
    }
    function admin_init() {
        register_setting( 'setting_ref', $this->name, array( $this, 'update_option' ) );
        $this->options = get_option( $this->name );
    }
    function admin_menu() {
        // change the following line to add_dashboard_page() instead of add_options_page() and the default "Settings saved" message will not appear on submit.
        $this->page = add_options_page( 'Test','Test','manage_options','translatable_demo', array( &$this , 'load' ) );
    }
    function update_option( $data ) {
        $clean = array_map( 'absint', $data );
        unset($data);
        return $clean;
    }
    function load() {
        ?>
        <div class="wrap">
            <?php screen_icon('index'); ?>
            <h2>Test</h2>
            <form action="options.php" method="post">
                <?php settings_fields( 'setting_ref' ); ?>
                <p><label for="<?php $this->field_name( 'fieldone') ?>">Field one <input value="<?php $this->get_option( 'fieldone') ?>" name="<?php $this->field_name( 'fieldone') ?>" type="text" /></label></p>
                <p><label for="<?php $this->field_name( 'fieldtwo') ?>">Field two <input value="<?php $this->get_option( 'fieldtwo') ?>" name="<?php $this->field_name( 'fieldtwo') ?>" type="text" /></label></p>
                <p class="submit"><input type="submit" name="Submit" class="button-secondary action" value="Save" /></p>
            </form>
            <!-- Output options data, so we can see how it currently looks -->
            <pre><?php print_r( $this->options ) ?></pre>
        </div>
        <?php
    }
    function field_name( $name, $echo = true ) {
        $name = "{$this->name}[$name]";
        if( $echo )
            echo $name;
        else
            return $name;
    }
    function get_option( $name, $echo = true ) {
        $val = '';
        if( is_array( $this->options ) && isset( $this->options[$name] ) )
            $val = $this->options[$name];

        if( $echo )
            echo $val;
        else
            return $val;
    }
}
$r = new RegisteredSettingsTest;