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<?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);
}