Fatal error: PHP error in file /www/htdocs/v080184/wbb3/wcf/lib/system/security/SecurityHandler.class.php (402): Function ereg() is deprecated

Information:

error message: PHP error in file /www/htdocs/v080184/wbb3/wcf/lib/system/security/SecurityHandler.class.php (402): Function ereg() is deprecated
error code: 0
file: /www/htdocs/v080184/wbb3/wcf/lib/system/WCF.class.php (255)
php version: 5.6.40-nmm7
wcf version: 1.0.11 pl 1 (Horizon)
date: Tue, 16 Apr 2024 11:46:10 +0000
request: /wbb3/wbb/index.php?s=5a231739e612c587b904ae4129179da7b7c369c6
referer: http://www.community-of-darkness.com/wbb3/wbb/index.php?action=BoardMarkAllAsRead&s=aaddb4059039e8f084dc8997c699473cdff07da8

Stacktrace:

#0 [internal function]: WCF::handleError(8192, 'Function ereg()...', '/www/htdocs/v08...', 402, Array)
#1 /www/htdocs/v080184/wbb3/wcf/lib/system/security/SecurityHandler.class.php(402): ereg()
#2 /www/htdocs/v080184/wbb3/wcf/lib/system/security/plugins/datatransfer/datatransfer.class.php(17): SecurityHandler->checkReferer()
#3 /www/htdocs/v080184/wbb3/wcf/lib/system/security/SecurityHandler.class.php(188): Datatransfer->execute(Object(SecurityHandler), 'datatransfer')
#4 /www/htdocs/v080184/wbb3/wcf/lib/system/security/SecurityHandler.class.php(67): SecurityHandler->fireActions()
#5 /www/htdocs/v080184/wbb3/wcf/lib/system/event/listener/SecurityListener.class.php(35): SecurityHandler->extendedSystem()
#6 /www/htdocs/v080184/wbb3/wcf/lib/system/event/EventHandler.class.php(117): SecurityListener->execute(Object(IndexPage), 'IndexPage', 'readParameters')
#7 /www/htdocs/v080184/wbb3/wcf/lib/system/event/EventHandler.class.php(142): EventHandler::executeInheritedActions(Object(IndexPage), 'readParameters', 'IndexPage', 'readParameters@...')
#8 /www/htdocs/v080184/wbb3/wcf/lib/page/AbstractPage.class.php(44): EventHandler::fireAction(Object(IndexPage), 'readParameters')
#9 /www/htdocs/v080184/wbb3/wcf/lib/page/AbstractPage.class.php(35): AbstractPage->readParameters()
#10 /www/htdocs/v080184/wbb3/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#11 /www/htdocs/v080184/wbb3/wcf/lib/util/RequestHandler.class.php(100): RequestHandler->__construct('Index', Array, 'page')
#12 /www/htdocs/v080184/wbb3/wbb/index.php(8): RequestHandler::handle(Array)
#13 {main}