WordPressManager.php

<?php

use Phinx\Db\Adapter\AdapterFactory;
use Phinx\Migration\Manager;
use Phinx\Migration\MigrationInterface;
use Symfony\Component\Console\Output\BufferedOutput;
use Symfony\Component\Console\Output\OutputInterface;

class WordPressManager extends Manager implements MigratorInterface
{
    /**
     * @var \wpdb
     */
    protected $db;

    /**
     * @var BufferedOutput
     */
    protected $output;

    /**
     * @var Container
     */
    protected $container;

    /**
     * @param \wpdb $wpdb
     */
    public function __construct(\wpdb $wpdb)
    {
        // global $wpdb can be used instead of injecting it if preferred
        $output = new BufferedOutput();
        $this->db = $wpdb;
        $config = $this->createWordPressConfiguration();


        $factory = AdapterFactory::instance();
        $factory->registerAdapter('wpdb', 'WpdbAdapter');

        parent::__construct($config, $output);
    }

    /**
     * Return the contents of the buffered output
     *
     * @return string
     */
    public function getBufferedOutput()
    {
        return $this->output->fetch();
    }

    /**
     * Return a configuration constructed using the WordPress database and DB constants
     *
     * @return Config
     */
    protected function createWordPressConfiguration()
    {
        $prefix = $this->db->prefix;

        $configArray = [
            //'migration_base_class' => 'AbstractBaseMigration', can provide a base migration if you need to
            'environments' => [
                'default_migration_table' => "{$prefix}myradplugin_migrations",
                'default_database' => 'production',
                'production' => [
                    'adapter' => 'wpdb',
                    'host' => DB_HOST,
                    'name' => DB_NAME,
                    'user' => DB_USER,
                    'pass' => DB_PASSWORD,
                    'charset' => DB_CHARSET,
                    'collation' => $this->db->get_charset_collate()
                ]
            ]
        ];

        return new Config($configArray);
    }
}