/**
* 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();
