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Edit File: visual-form-builder.php

<?php
/*
Plugin Name:  Visual Form Builder
Plugin URI: https://wordpress.org/plugins/visual-form-builder/
Description:  Dynamically build forms using a simple interface. Forms include jQuery validation, a basic logic-based verification system, and entry tracking.
Version:  3.1
Author: Matthew Muro
Author URI: http://vfbpro.com
Text Domain:  visual-form-builder
Domain Path:  /languages/
*/

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	exit;
}

class Visual_Form_Builder {

/**
	 * The unique identifier of this plugin.
	 *
	 * @var [type]
	 */
	protected $plugin_name = 'visual-form-builder';

/**
	 * The current version of the plugin.
	 *
	 * @var [type]
	 */
	protected $version = '3.1';

/**
	 * The current DB version. Used if we need to update the DB later.
	 *
	 * @var [type]
	 */
	protected $db_version = '2.9';

/**
	 * The main instance of Visual_Form_Builder
	 *
	 * @var [type]
	 */
	private static $instance = null;

/**
	 * Protected constructor to prevent creating a new instance of Visual_Form_Builder
	 * via the 'new' operator from outside of this class.
	 *
	 * @return void
	 */
	protected function __construct() {}

/**
	 * Private clone method to prevent cloning of the instance.
	 *
	 * @return void
	 */
	private function __clone() {}

/**
	 * Private unserialize method to prevent unserializing of the instance.
	 *
	 * @return void
	 */
	private function __wakeup() {}

/**
	 * Create a single Visual_Form_Builder instance
	 *
	 * Insures that only one instance of Visual_Form_Builder is running.
	 * Otherwise known as the Singleton class pattern
	 *
	 * @since  3.0
	 * @access public
	 * @static
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new Visual_Form_Builder();
			self::$instance->setup_constants();
			self::$instance->includes();
			self::$instance->autoload_classes();

// Install DB.
			register_activation_hook( __FILE__, array( self::$instance, 'install' ) );

// Update DB.
			add_action( 'plugins_loaded', array( self::$instance, 'upgrade_db_check' ) );

// Load i18n.
			add_action( 'plugins_loaded', array( self::$instance, 'lang' ) );

$screen_options = new Visual_Form_Builder_Admin_Screen_Options();
			add_filter( 'set-screen-option', array( $screen_options, 'save_option' ), 10, 3 );
		}

return self::$instance;
	}

/**
	 * Setup constants
	 */
	private function setup_constants() {
		global $wpdb;

// Database version.
		if ( ! defined( 'VFB_WP_DB_VERSION' ) ) {
			define( 'VFB_WP_DB_VERSION', $this->db_version );
		}

// Plugin version.
		if ( ! defined( 'VFB_WP_PLUGIN_VERSION' ) ) {
			define( 'VFB_WP_PLUGIN_VERSION', $this->version );
		}

// Plugin Folder Path.
		if ( ! defined( 'VFB_WP_PLUGIN_DIR' ) ) {
			define( 'VFB_WP_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
		}

// Plugin Folder URL.
		if ( ! defined( 'VFB_WP_PLUGIN_URL' ) ) {
			define( 'VFB_WP_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
		}

// Plugin Root File.
		if ( ! defined( 'VFB_WP_PLUGIN_FILE' ) ) {
			define( 'VFB_WP_PLUGIN_FILE', __FILE__ );
		}

// Form table name.
		if ( ! defined( 'VFB_WP_FORMS_TABLE_NAME' ) ) {
			define( 'VFB_WP_FORMS_TABLE_NAME', $wpdb->prefix . 'visual_form_builder_forms' );
		}

// Field table name.
		if ( ! defined( 'VFB_WP_FIELDS_TABLE_NAME' ) ) {
			define( 'VFB_WP_FIELDS_TABLE_NAME', $wpdb->prefix . 'visual_form_builder_fields' );
		}

// Form meta table name.
		if ( ! defined( 'VFB_WP_ENTRIES_TABLE_NAME' ) ) {
			define( 'VFB_WP_ENTRIES_TABLE_NAME', $wpdb->prefix . 'visual_form_builder_entries' );
		}
	}

/**
	 * Include files
	 */
	private function includes() {
		include_once VFB_WP_PLUGIN_DIR . 'inc/class-install.php';
		include_once VFB_WP_PLUGIN_DIR . 'inc/class-uninstall.php';
		include_once VFB_WP_PLUGIN_DIR . 'inc/class-i18n.php';
		if ( ! class_exists( 'WP_List_Table' ) ) {
			include_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
		}
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-admin-menu.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-admin-notices.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-screen-options.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-media-button.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-dashboard-widgets.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-widget.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-load-css-js.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-entries-detail.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-entries-list.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-forms-list.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-forms-new.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-forms-edit.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-fields.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-page-settings.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-ajax.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-save.php';
		include_once VFB_WP_PLUGIN_DIR . 'admin/class-export.php';
		include_once VFB_WP_PLUGIN_DIR . 'public/class-form-display.php';
		include_once VFB_WP_PLUGIN_DIR . 'public/class-load-css-js.php';
		include_once VFB_WP_PLUGIN_DIR . 'public/class-confirmation.php';
		include_once VFB_WP_PLUGIN_DIR . 'public/class-email.php';
		include_once VFB_WP_PLUGIN_DIR . 'public/class-security.php';
	}

/**
	 * Install DB
	 */
	public function install() {
		$install = new Visual_Form_Builder_Install();
		$install->install();
	}

/**
	 * Check database version and run SQL install, if needed
	 */
	public function upgrade_db_check() {
		$current_db_version = VFB_WP_DB_VERSION;

if ( get_option( 'vfb_db_version' ) != $current_db_version ) {
			$install = new Visual_Form_Builder_Install();
			$install->install_db();
		}
	}

/**
	 * Load localization file
	 */
	public function lang() {
		$i18n = new Visual_Form_Builder_I18n();
		$i18n->set_domain( $this->plugin_name );

$i18n->load_lang();
	}

/**
	 * Autoload some VFB classes that aren't loaded via other files.
	 */
	public function autoload_classes() {
		$admin_menu        = new Visual_Form_Builder_Admin_Menu();
		$admin_ajax        = new Visual_Form_Builder_Admin_AJAX();
		$admin_save        = new Visual_Form_Builder_Admin_Save();
		$admin_notices     = new Visual_Form_Builder_Admin_Notices();
		$dashboard_widgets = new Visual_Form_Builder_Dashboard_Widgets();
		$export            = new Visual_Form_Builder_Export();
		$media_button      = new Visual_Form_Builder_Media_Button();

Visual_Form_Builder_Form_Display::instance();
	}
}

/**
 * The main function responsible for returning Visual Form Builder forms and functionality.
 *
 * @return [type] [description]
 */
function visual_form_builder_plugin_instance() {
	return Visual_Form_Builder::instance();
}

visual_form_builder_plugin_instance();