Warning: mysqli_query() expects at least 2 parameters, 1 given in /customers/d/6/7/ansager.info/httpd.www/index.php on line 79

Fatal error: Uncaught Error: Call to undefined function mysql_error() in /customers/d/6/7/ansager.info/httpd.www/index.php:79
Stack trace:
#0 /customers/d/6/7/ansager.info/httpd.www/index.php(91): users_id_taken()
#1 {main}
  thrown in /customers/d/6/7/ansager.info/httpd.www/index.php on line 79