DesignPatternsPHP/ServiceLocator/ServiceLocatorInterface.php

<?php

namespace DesignPatterns\ServiceLocator;

interface ServiceLocatorInterface 
{
    /**
     * Checks if a service is registered.
     *
     * @param string $interface
     *
     * @return bool
     */
    public function has($interface);

    /**
     * Gets the service registered for the interface.
     *
     * @param string $interface
     *
     * @return mixed
     */
    public function get($interface);
}