Wordpress theme option admin page. Works on CMB. Has hook for adding options, based on https://github.com/WebDevStudios/Custom-Metaboxes-and-Fields-for-WordPress/wiki/Using-CMB-to-create-an-Admin-Theme-Options-Page

gistfile1.txt

<?php
/**
 * CMB Theme Options
 * @version 0.1.0
 */
class Theme_options_admin {

    /**
     * Option key, and option page slug
     * @var string
     */
    protected static $key = 'theme_options';

    /**
     * Array of metaboxes/fields
     * @var array
     */
    protected static $options = array();

    /**
     * Options Page title
     * @var string
     */
    protected $title = '';

    /**
     * Constructor
     * @since 0.1.0
     */
    public function __construct() {
        // Set our title
        $this->title = __( 'Site Options', 'goodbite' );
    }

    /**
     * Initiate our hooks
     * @since 0.1.0
     */
    public function hooks() {
        add_action( 'admin_init', array( $this, 'init' ) );
        add_action( 'admin_menu', array( $this, 'add_options_page' ) );
    }

    /**
     * Register our setting to WP
     * @since  0.1.0
     */
    public function init() {
        register_setting( self::$key, self::$key );
    }

    /**
     * Add menu options page
     * @since 0.1.0
     */
    public function add_options_page() {
        $this->options_page = add_menu_page( $this->title, $this->title, 'manage_options', self::$key, array( $this, 'admin_page_display' ), '', 62 );
    }

    /**
     * Admin page markup. Mostly handled by CMB
     * @since  0.1.0
     */
    public function admin_page_display() {
        ?>
        <div class="wrap cmb_options_page <?php echo self::$key; ?>">
            <h2><?php echo esc_html( get_admin_page_title() ); ?></h2>
            <?php cmb_metabox_form( self::options_fields(), self::$key ); ?>
        </div>
        <?php
    }

    /**
     * Adds fields to the option page fields
     * @since  0.1.0
     * @param mulitdimensional arrays
     * @return mulitdimensional arrays
     */
    public static function add_fields($fields){
        self::$options = self::options_fields();
        foreach ($fields as $field) {
            if ( is_array($field) ){
               array_push(self::$options['fields'], $field);
            }
        }   
    }

    /**
     * Defines the theme option metabox and field configuration
     * @since  0.1.0
     * @return array
     */
    public static function options_fields() {

        // Only need to initiate the array once per page-load
        if ( ! empty( self::$options ) )
            return self::$options;

        self::$options = array(
            'id'         => 'options',
            'show_on'    => array( 'key' => 'options-page', 'value' => array( self::$key, ), ),
            'show_names' => true,
            'fields'     => array(),
        );
        return self::$options;
    }

    /**
     * Make public the protected $key variable.
     * @since  0.1.0
     * @return string  Option key
     */
    public static function key() {
        return self::$key;
    }

}

// Get it started
$goodbite_admin = new Theme_options_admin();
$goodbite_admin->hooks();

/**
 * Wrapper function around cmb_get_option
 * @since  0.1.0
 * @param  string  $key Options array key
 * @return mixed        Option value
 */
function goodbite_get_option( $key = '' ) {
    return cmb_get_option( Theme_options_admin::key(), $key );
}