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	<?php

	phabricator_startup();

	$fatal_exception = null;
	try {
	PhabricatorStartup::beginStartupPhase('libraries');
	PhabricatorStartup::loadCoreLibraries();

	PhabricatorStartup::beginStartupPhase('purge');
	PhabricatorCaches::destroyRequestCache();

	PhabricatorStartup::beginStartupPhase('sink');
	$sink = new AphrontPHPHTTPSink();

	// PHP introduced a "Throwable" interface in PHP 7 and began making more
	// runtime errors throw as "Throwable" errors. This is generally good, but
	// makes top-level exception handling that is compatible with both PHP 5
	// and PHP 7 a bit tricky.

	// In PHP 5, "Throwable" does not exist, so "catch (Throwable $ex)" catches
	// nothing.

	// In PHP 7, various runtime conditions raise an Error which is a Throwable
	// but NOT an Exception, so "catch (Exception $ex)" will not catch them.

	// To cover both cases, we "catch (Exception $ex)" to catch everything in
	// PHP 5, and most things in PHP 7. Then, we "catch (Throwable $ex)" to catch
	// everything else in PHP 7. For the most part, we only need to do this at
	// the top level.

	$main_exception = null;
	try {
	PhabricatorStartup::beginStartupPhase('run');
	AphrontApplicationConfiguration::runHTTPRequest($sink);
	} catch (Exception $ex) {
	$main_exception = $ex;
	} catch (Throwable $ex) {
	$main_exception = $ex;
	}

	if ($main_exception) {
	$response_exception = null;
	try {
	$response = new AphrontUnhandledExceptionResponse();
	$response->setException($main_exception);
	$response->setShowStackTraces($sink->getShowStackTraces());

	PhabricatorStartup::endOutputCapture();
	$sink->writeResponse($response);
	} catch (Exception $ex) {
	$response_exception = $ex;
	} catch (Throwable $ex) {
	$response_exception = $ex;
	}

	// If we hit a rendering exception, ignore it and throw the original
	// exception. It is generally more interesting and more likely to be
	// the root cause.

	if ($response_exception) {
	throw $main_exception;
	}
	}
	} catch (Exception $ex) {
	$fatal_exception = $ex;
	} catch (Throwable $ex) {
	$fatal_exception = $ex;
	}

	if ($fatal_exception) {
	PhabricatorStartup::didEncounterFatalException(
	'Core Exception',
	$fatal_exception,
	false);
	}

	function phabricator_startup() {
	// Load the PhabricatorStartup class itself.
	$t_startup = microtime(true);
	$root = dirname(dirname(__FILE__));
	require_once $root.'/support/startup/PhabricatorStartup.php';

	// Load client limit classes so the preamble can configure limits.
	require_once $root.'/support/startup/PhabricatorClientLimit.php';
	require_once $root.'/support/startup/PhabricatorClientRateLimit.php';
	require_once $root.'/support/startup/PhabricatorClientConnectionLimit.php';
	require_once $root.'/support/startup/preamble-utils.php';

	// If the preamble script exists, load it.
	$t_preamble = microtime(true);
	$preamble_path = $root.'/support/preamble.php';
	if (file_exists($preamble_path)) {
	require_once $preamble_path;
	}

	$t_hook = microtime(true);
	PhabricatorStartup::didStartup($t_startup);

	PhabricatorStartup::recordStartupPhase('startup.init', $t_startup);
	PhabricatorStartup::recordStartupPhase('preamble', $t_preamble);
	PhabricatorStartup::recordStartupPhase('hook', $t_hook);
	}

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