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PhabricatorScopedEnv.php
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			<?php

			/**
			* Scope guard to hold a temporary environment. See @{class:PhabricatorEnv} for
			* instructions on use.
			*
			* @task internal Internals
			* @task override Overriding Environment Configuration
			*/
			final class PhabricatorScopedEnv extends Phobject {

			private $key;
			private $isPopped = false;

			/* -( Overriding Environment Configuration )------------------------------- */

			/**
			* Override a configuration key in this scope, setting it to a new value.
			*
			* @param string $key Key to override.
			* @param wild $value New value.
			* @return $this
			*
			* @task override
			*/
			public function overrideEnvConfig($key, $value) {
			PhabricatorEnv::overrideTestEnvConfig(
			$this->key,
			$key,
			$value);
			return $this;
			}


			/* -( Internals )---------------------------------------------------------- */


			/**
			* @task internal
			*/
			public function __construct($stack_key) {
			$this->key = $stack_key;
			}


			/**
			* Release the scoped environment.
			*
			* @return void
			* @task internal
			*/
			public function __destruct() {
			if (!$this->isPopped) {
			PhabricatorEnv::popTestEnvironment($this->key);
			$this->isPopped = true;
			}
			}

			}