Experimental plugin manager compliant with ContainerInterface

pluginmanager.php

<?php 
/**
 * Experimantal plugin manager complaint with ContainerInterface with options support
 * using the optional Interface rule of  PHP
 */
 use Interop\Container\ContainerInterface;


class PluginManager implements ContainerInterface
{
    /**
     * Default set of symmetric adapters
     *
     * @var array
     */
    protected $plugins = [
        'key' => Class::class, // key => Plugin to use
    ];
    /**
     * Do we have the plugin?
     *
     * @param  string $id
     * @return bool
     */
    public function has($id)
    {
        return array_key_exists($id, $this->plugins);
    }
    /**
     * Retrieve the symmetric plugin
     *
     * @param  string $id
     * @param  mixed $options
     * @return object
     */
    public function get($id, $options = null)
    {
        $class = $this->plugins[$id];
        return new $class($options);
    }
}