README

A drop-in library for handling upgrade routines in WordPress plugins and themes.

Installation

• Run composer require wp-forge/wp-upgrade-handler
• Make sure you require the vendor/autoload.php file in your project.

Usage

Here is an example of how to use this library in a WordPress plugin or theme:

<?php

use WP_Forge\UpgradeHandler\UpgradeHandler;

// Define the current plugin version in the code
define( 'MY_PLUGIN_VERSION', '1.4.1' );

// Only handle upgrades in the admin
if ( is_admin() ) {

	// Handle plugin upgrades
	$upgrade_handler = new UpgradeHandler(
		__DIR__ . '/upgrades',              // Directory where upgrade routines live
		get_option( 'my_plugin_version' ),  // Old plugin version (from database)
		MY_PLUGIN_VERSION                   // New plugin version (from code)
	);

	// Returns true if the old version doesn't match the new version
	$did_upgrade = $upgrade_handler->maybe_upgrade();

	if ( $did_upgrade ) {
		// If an upgrade occurred, update the new version in the database to prevent running the routine(s) again.
		update_option( 'my_plugin_version', MY_PLUGIN_VERSION, true );
	}
}

If you just released version 1.4.1 of your plugin, but created upgrade routines for 1.4.1 and 1.3.9, anyone upgrading from version 1.3.8 or earlier would have both of those upgrade routines run automatically. If someone is upgrading from version 1.3.9 or greater, then only the 1.4.1 upgrade routine would be run.

Creating an Upgrade Routine

As an example, let's assume I just released version 1.4.1 of my plugin. The upgrade routine needs to change an option name in the database. All I need to do after adding the previous code from above is to create a file named 1.4.1.php in my upgrades directory.

The following would be the contents of that file:

<?php

// Rename 'old_option' to 'new_option', if necessary.
$old_option = get_option( 'old_option' );
if( $old_option ) {
    update_option( 'new_option', get_option( 'old_option' ) );
    delete_option( 'old_option' );
}