better-testing

PhabricatorLocaleScopeGuard.php
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			<?php

			/**
			* Change the effective locale for the lifetime of this guard.
			*
			* Use @{method:PhabricatorEnv::beginScopedLocale} to acquire a guard.
			* Guards are released when they exit scope.
			*/
			final class PhabricatorLocaleScopeGuard
			extends Phobject {

			private static $stack = array();
			private $key;
			private $destroyed;

			public function __construct($code) {
			// If this is the first time we're building a guard, push the default
			// locale onto the bottom of the stack. We'll never remove it.
			if (empty(self::$stack)) {
			self::$stack[] = PhabricatorEnv::getLocaleCode();
			}

			// If there's no locale, use the server default locale.
			if (!$code) {
			$code = self::$stack[0];
			}

			// Push this new locale onto the stack and set it as the active locale.
			// We keep track of which key this guard owns, in case guards are destroyed
			// out-of-order.
			self::$stack[] = $code;
			$this->key = last_key(self::$stack);

			PhabricatorEnv::setLocaleCode($code);
			}

			public function __destruct() {
			if ($this->destroyed) {
			return;
			}
			$this->destroyed = true;

			// Remove this locale from the stack and set the new active locale. Usually,
			// we're the last item on the stack, so this shortens the stack by one item
			// and sets the locale underneath. However, it's possible that guards are
			// being destroyed out of order, so we might just be removing an item
			// somewhere in the middle of the stack. In this case, we won't actually
			// change the locale, just set it to its current value again.

			unset(self::$stack[$this->key]);
			PhabricatorEnv::setLocaleCode(end(self::$stack));
			}

			}