<?php
 /**
  * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file)
  */
 
 namespace Psr\Container;
 
 /**
  * Describes the interface of a container that exposes methods to read its entries.
  */
 interface ContainerInterface
 {
     /**
      * Finds an entry of the container by its identifier and returns it.
      *
      * @param string $id Identifier of the entry to look for.
      *
      * @throws NotFoundExceptionInterface  No entry was found for **this** identifier.
      * @throws ContainerExceptionInterface Error while retrieving the entry.
      *
      * @return mixed Entry.
      */
     public function get($id);
 
     /**
      * Returns true if the container can return an entry for the given identifier.
      * Returns false otherwise.
      *
      * `has($id)` returning true does not mean that `get($id)` will not throw an exception.
      * It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`.
      *
      * @param string $id Identifier of the entry to look for.
      *
      * @return bool
      */
     public function has($id);
 }