/** * Fetch/create the singleton instance * * @return object $instance */ public static function instance() { if (self::$instance === null) { self::$instance = new self(); add_action('admin_menu', array(self::instance(), 'init'), 30); add_filter('gform_field_content', array(self::instance(), 'gform_field_content'), 10, 5); } return self::$instance; }
<?php /** * Plugin Name: Gravity Forms: Checkbox Group * Plugin URI: https://github.com/tyxla/gravity-forms-checkbox-groups * Description: Provides the option to add groups to your select checkbox fields in Gravity Forms. Requires the Gravity Forms plugin to be activated. * Version: 1.0 * Author: Marin Atanasov * Author URI: http://marinatanasov.com/ * Tested up to: 4.5 * License: GPL2 */ // main plugin constants define('GFCB_PLUGIN_NAME', 'Gravity Forms: Checkbox Group'); define('GFCB_PLUGIN_VERSION', '1.0'); define('GFCB_PLUGIN_DIRNAME', basename(dirname(__FILE__))); define('GFCB_PLUGIN_URL', WP_PLUGIN_URL . '/' . GFCB_PLUGIN_DIRNAME); define('GFCB_PLUGIN_DIR', WP_PLUGIN_DIR . DIRECTORY_SEPARATOR . GFCB_PLUGIN_DIRNAME); define('GFCB_PLUGIN_INCLUDES_DIR', GFCB_PLUGIN_DIR . DIRECTORY_SEPARATOR . 'inc' . DIRECTORY_SEPARATOR); // main plugin class include_once GFCB_PLUGIN_INCLUDES_DIR . 'class.Gravity-Forms-Checkbox-Group.php'; // initializing the plugin $gfcb = Gravity_Forms_Checkbox_Group::instance();