Plugin
, (*1)
A class to use in your WordPress plugin to prevent updates to the plugin, ensure dependency plugin(s) is/are active, and to hide specific plugin(s)., (*2)
Description
These classes solve three (3) particular problems:
1. Preventing plugins from updating, (*3)
Plugins and themes are automatically checked by WordPress for updates in the WordPress repository. This poses a special problem for private plugins if the plugin slug happens to match.
-
Hiding Plugins, (*4)
It is a best practice to move specific functionality to a core functionality plugin. One could use a mu-plugin but most use a standard plugin. However, the client could easily deactivate or delete the plugin. Therefore, hiding the plugin from the plugins page becomes very important., (*5)
-
Extending Plugins, (*6)
Many core functionality plugins extend/modify other plugins. If the dependency plugin that is being extended is deactivated, then the plugin makes the WordPress instance unstable and breaks the whole site., (*7)
-
Uninstalling Plugins, (*8)
It is a best practice to always uninstall your plugin data and files. However, an interface to determine what should be uninstalled needs to be built. This uses WP Pointers to create such an interface giving the user the choice to uninstall just the plugin files or everything., (*9)
-
Building Plugins, (*10)
When building a plugin, this library provides a base class to be extended as the new plugins core class., (*11)
Installation
This isn't a WordPress plugin on its own, so the usual instructions don't apply. Instead you can install manually or using composer., (*12)
Manually install class
Copy Plugin/src folder into your plugin for basic usage. Be sure to require the various files accordingly., (*13)
or:, (*14)
Install class via Composer
- Tell Composer to install this class as a dependency:
composer require wpsmith/plugin
- Recommended: Install the Mozart package:
composer require coenjacobs/mozart --dev and configure it.
- The class is now renamed to use your own prefix to prevent collisions with other plugins bundling this class.
Implementation & Usage
Update Prevention
To prevent the current plugin from updating:, (*15)
new \WPS\WP\Plugin\PreventUpdate( plugin_basename( __FILE__ ) );
To prevent another plugin (e.g., ACF) from updating:, (*16)
new \WPS\WP\Plugin\PreventUpdate( 'advanced-custom-fields-pro/acf.php' );
Hiding Plugin(s)
To hide the current plugin:, (*17)
new \WPS\WP\Plugin\HidePlugin( plugin_basename( __FILE__ ) );
To hide another plugin (e.g., ACF):, (*18)
new \WPS\WP\Plugin\HidePlugin( 'advanced-custom-fields-pro/acf.php' );
Extending Plugin(s)
To extend ACF, you would do something like this:, (*19)
new \WPS\WP\Plugin\ExtendPlugin( 'advanced-custom-fields-pro/acf.php', __FILE__, '5.8.7', 'plugin-text-domain' );
Uninstalling Plugin(s)
To use the UninstallManager, you would do something like this at the plugin's root:, (*20)
Simple example
Within the plugin's main file:, (*21)
global $my_plugin_uninstaller;
$my_plugin_uninstaller = new \WPS\WP\Plugin\UninstallManager( __FILE__ );
// Register activation stuffs.
register_activation_hook( __FILE__, function() {
global $my_plugin_uninstaller;
UninstallManager::on_activation( $my_plugin_uninstaller );
} );
// Register deactivation stuffs.
register_deactivation_hook( __FILE__, function() {
global $my_plugin_uninstaller;
UninstallManager::on_deactivation( $my_plugin_uninstaller );
} );
// If not using an uninstall.php, you need to register uninstall stuffs.
register_uninstall_hook( __FILE__, function() {
global $my_plugin_uninstaller;
$wps_codeable_delete_action = $my_plugin_uninstaller->get_uninstall_action();
// Bail if not deleting everything.
if ( 'everything' !== $wps_codeable_delete_action ) {
return;
}
// Delete Options.
$my_plugin_uninstaller->uninstall();
} );
A Better Example
Within the main plugin file:, (*22)
/**
* Gets uninstall manager.
*
* This function can be placed anywhere. Alternatively, you can use a global variable to hold the uninstaller.
*
* @param string $plugin_file Absolute path to plugin base file.
*
* @return \WPS\WP\Plugin\UninstallManager
*/
function get_uninstall_manager( $plugin_file ) {
static $mgr;
if ( null === $mgr ) {
$mgr = new \WPS\WP\Plugin\UninstallManager( $plugin_file );
}
return $mgr;
}
// Setup Uninstall Manager at base of the plugin.
get_uninstall_manager( __FILE__ );
register_activation_hook( __FILE__, function() {
UninstallManager::on_activation( get_uninstall_manager() );
} );
register_deactivation_hook( __FILE__, function() {
UninstallManager::on_deactivation( get_uninstall_manager() );
} );
Then in uninstall.php:, (*23)
// Require the main plugin file.
require_once( 'plugin.php' );
// Get what we are supposed to do on deletion/uninstall.
$uninstall_manager = get_uninstall_manager();
$wps_codeable_delete_action = $uninstall_manager->get_uninstall_action();
// Bail if not deleting everything.
if ( 'everything' !== $wps_codeable_delete_action ) {
return;
}
// Delete Options.
$uninstall_manager->uninstall();
Building a Plugin
For all my plugins, I build a base class for the main plugin. Out of the box, PluginBase does three things:
1. Loads plugin's text domain accordingly.
1. Implements Singleton so there can only be one.
1. Provides the following methods:
* Plugin::doing_ajax() or PluginBase::doing_ajax() - determines whether WP is processing an AJAX request.
* Plugin::get_version() - gets the plugin's version. Defaults to 0.0.0.
* Plugin::get_plugin_name() - gets the plugin's name. Defaults to wps.~~~~
* $this->get_template_loader() - gets the plugin's template loader. See TemplateLoader.
* $this->add_action() - Either adds the action to the correct hook or performs the action if the hook has already been done or is being done., (*24)
Generally speaking, it goes something like this:, (*25)
namespace WPS\WP\Plugins\MyPlugin;
use WPS\WP\Plugin\PluginBase;
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
if ( ! class_exists( __NAMESPACE__ . '\Plugin' ) ) {
/**
* Class Plugin
*
* @package \WPS\WP\Plugins\MyPlugin
*/
class Plugin extends PluginBase {
/**
* Plugin constructor.
*
* @param array $args Optional args.
*
* @since 0.0.1
*/
protected function __construct( $args = array() ) {
// Construct the parent.
parent::__construct( $args );
}
}
}
// Instantiate.
Plugin::get_instance( array(
'name' => 'my-plugin',
'version' => '0.0.1',
'file' => __FILE__,
) );
Change Log
See the change log., (*26)
License
GPL 2.0 or later., (*27)
Contributions
Contributions are welcome - fork, fix and send pull requests against the master branch please., (*28)
Credits
Built by Travis Smith
Copyright 2013-2020 Travis Smith, (*29)
Wallogit.com
