Fatal error: Uncaught Error: Call to undefined function session_is_registered() in /home/httpd/vhosts/ireservation.ch/httpdocs/demo/includes/session.php:8
Stack trace:
#0 /home/httpd/vhosts/ireservation.ch/httpdocs/demo/index.php(11): include()
#1 {main}
  thrown in /home/httpd/vhosts/ireservation.ch/httpdocs/demo/includes/session.php on line 8