2.3/unlock__upgrade_8php_source.html

 <?php
 $mutex = _elgg_services()->mutex;

 if ($mutex->isLocked('upgrade')) {
     $mutex->unlock('upgrade');
 }
 system_message(elgg_echo('upgrade:unlock:success'));
 forward(REFERER);
elgg_echo
elgg_echo($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

forward
elgg forward
Meant to mimic the php forward() function by simply redirecting the user to another page...
Definition: elgglib.js:425

REFERER
const REFERER
Definition: elgglib.php:2123

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

system_message
elgg system_message
Wrapper function for system_messages.
Definition: elgglib.js:390