Warning: array_map() expects parameter 1 to be a valid callback, function '_filterData' not found or invalid function name in /home/httpd/vhosts/michaelster.ch/httpdocs/lernen/tn_new.php on line 8

Warning: array_merge(): Expected parameter 2 to be an array, null given in /home/httpd/vhosts/michaelster.ch/httpdocs/lernen/tn_new.php on line 66

Fatal error: Uncaught Error: Call to a member function setVariable() on null in /home/httpd/vhosts/michaelster.ch/httpdocs/lernen/tn_new.php:68
Stack trace:
#0 {main}
  thrown in /home/httpd/vhosts/michaelster.ch/httpdocs/lernen/tn_new.php on line 68