ConnectionManager.php

<?php

/**
 * @package ActiveRecord
 */

namespace ActiveRecord;

/**
 * Singleton to manage any and all database connections.
 *
 * @package ActiveRecord
 */
class ConnectionManager extends Singleton
{
    /**
     * Array of {@link Connection} objects.
     *
     * @var array<string,Connection>
     */
    private static array $connections = [];

    /**
     * If $name is null then the default connection will be returned.
     *
     * @see Config
     *
     * @param string $name Optional name of a connection
     *
     * @return Connection
     */
    public static function get_connection(?string $name=null)
    {
        $config = Config::instance();
        $name = $name ?? $config->get_default_connection();

        if (!isset(self::$connections[$name]->connection)) {
            self::$connections[$name] = Connection::instance($config->get_connection($name));
        }

        return self::$connections[$name];
    }

    /**
     * Drops the connection from the connection manager. Does not actually close it since there
     * is no close method in PDO.
     *
     * @param string $name Name of the connection to forget about
     */
    public static function drop_connection(string $name): void
    {
        unset(self::$connections[$name]);
    }
}