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PhabricatorExtensionsSetupCheck.php
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			<?php

			final class PhabricatorExtensionsSetupCheck extends PhabricatorSetupCheck {

			public function getDefaultGroup() {
			return self::GROUP_PHP;
			}

			public function isPreflightCheck() {
			return true;
			}

			protected function executeChecks() {
			// TODO: Make 'mbstring' a soft requirement.

			$required = array(
			'hash',
			'json',
			'openssl',
			'mbstring',
			'ctype',

			// There is a tiny chance we might not need this, but a significant
			// number of applications require it and it's widely available.
			'curl',
			);

			$need = array();
			foreach ($required as $extension) {
			if (!extension_loaded($extension)) {
			$need[] = $extension;
			}
			}

			if (!extension_loaded('mysqli') && !extension_loaded('mysql')) {
			$need[] = 'mysqli or mysql';
			}

			if (!$need) {
			return;
			}

			$message = pht('Required PHP extensions are not installed.');

			$issue = $this->newIssue('php.extensions')
			->setIsFatal(true)
			->setName(pht('Missing Required Extensions'))
			->setMessage($message);

			foreach ($need as $extension) {
			$issue->addPHPExtension($extension);
			}
			}
			}