2.3/unlock__upgrade_8php_source.html

 <?php

 $mutex = _elgg_services()->mutex;


 if ($mutex->isLocked('upgrade')) {

     $mutex->unlock('upgrade');

 }

 system_message(elgg_echo('upgrade:unlock:success'));

 forward(REFERER);

system_message
system_message($message)
Display a system message on next page load.
Definition: elgglib.php:450

REFERER
const REFERER
Definition: elgglib.php:2123

forward
forward($location="", $reason='system')
Forward to $location.
Definition: elgglib.php:94

_elgg_services
_elgg_services(\Elgg\Di\ServiceProvider $services=null)
Get the global service provider.
Definition: autoloader.php:17

elgg_echo
elgg_echo($message_key, $args=array(), $language="")
Given a message key, returns an appropriately translated full-text string.
Definition: languages.php:21

$mutex
$mutex
Unlocks the upgrade script.
Definition: unlock_upgrade.php:6