<?php namespace Dotenv\Environment\Adapter; interface AdapterInterface { /** * Determines if the adapter is supported. * * @return bool */ public function isSupported(); /** * Get an environment variable, if it exists. * * @param string $name * * @return \PhpOption\Option */ public function get($name); /** * Set an environment variable. * * @param string $name * @param string|null $value * * @return void */ public function set($name, $value = null); /** * Clear an environment variable. * * @param string $name * * @return void */ public function clear($name); }