Warning: mysql_connect(): Access denied for user 'xisql_user#'@'localhost' (using password: YES) in /var/www/html/book/include/link.php on line 3

Fatal error: Uncaught TypeError: mysql_select_db(): Argument #2 ($link_identifier) must be of type resource, bool given in /var/www/html/book/include/link.php:4 Stack trace: #0 /var/www/html/book/include/link.php(4): mysql_select_db() #1 /var/www/html/book/include/header_inc.php(37): require_once('...') #2 /var/www/html/book/index.php(13): require_once('...') #3 {main} thrown in /var/www/html/book/include/link.php on line 4