Fatal error: PHP error in file /home/ch24778/web/rr-club.ch/public_html/lib/page/IrcChatPage.class.php (38): Function ereg_replace() is deprecated

Information:

error message: PHP error in file /home/ch24778/web/rr-club.ch/public_html/lib/page/IrcChatPage.class.php (38): Function ereg_replace() is deprecated
error code: 0
file: /home/ch24778/web/rr-club.ch/public_html/wcf/lib/system/WCF.class.php (255)
php version: 5.6.40-70+ubuntu20.04.1+deb.sury.org+1
wcf version: 1.0.11 (Horizon)
date: Sat, 20 Apr 2024 00:17:04 +0000
request: /index.php?page=IrcChat&s=47a93b9d974e13aa5c6c0fda0101434f76f632c3
referer:

Stacktrace:

#0 [internal function]: WCF::handleError(8192, 'Function ereg_r...', '/home/ch24778/w...', 38, Array)
#1 /home/ch24778/web/rr-club.ch/public_html/lib/page/IrcChatPage.class.php(38): ereg_replace()
#2 /home/ch24778/web/rr-club.ch/public_html/wcf/lib/page/AbstractPage.class.php(36): IrcChatPage->show()
#3 /home/ch24778/web/rr-club.ch/public_html/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#4 /home/ch24778/web/rr-club.ch/public_html/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('IrcChat', Array, 'page')
#5 /home/ch24778/web/rr-club.ch/public_html/index.php(8): RequestHandler::handle(Array)
#6 {main}