Warning: mysqli_select_db() expects exactly 2 parameters, 3 given in /hotel/apache/htdocs/webdev_its/lib/se/uu/its/misc/classDatabase.php on line 19

Fatal error: Uncaught Error: Call to undefined function mysql_close() in /hotel/apache/htdocs/webdev_its/lib/se/uu/its/misc/classDatabase.php:20
Stack trace:
#0 /hotel/apache/htdocs/webdev_its/lib/se/uu/its/misc/classDatabase.php(62): Database->_openDB()
#1 /hotel/apache/htdocs/bmc/config/config.php(64): Database->Database(Array)
#2 /hotel/apache/htdocs/bmc/index.php(2): require_once('/hotel/apache/h...')
#3 {main}
  thrown in /hotel/apache/htdocs/webdev_its/lib/se/uu/its/misc/classDatabase.php on line 20