MySQL Error: The PHP MySQL extentions have not been installed. Please ask your administrator to add them to your PHP installation.

Fatal error: Uncaught Error: Call to undefined function mysql_query() in /homepages/7/d355830192/htdocs/functions/functions-db.php:52 Stack trace: #0 /homepages/7/d355830192/htdocs/functions/functions-db.php(62): query('SELECT * FROM h...') #1 /homepages/7/d355830192/htdocs/class/Heroe.class.php(21): query_single_row('SELECT * FROM h...') #2 /homepages/7/d355830192/htdocs/class/Heroe.class.php(15): Heroe->initFromId('19') #3 /homepages/7/d355830192/htdocs/pages/heroe.php(5): Heroe::instanceFromId('19') #4 /homepages/7/d355830192/htdocs/functions/functions.php(49): include('/homepages/7/d3...') #5 /homepages/7/d355830192/htdocs/functions/permalinks.php(12): get_include_contents('pages/heroe.php') #6 /homepages/7/d355830192/htdocs/index.php(4): require_once('/homepages/7/d3...') #7 {main} thrown in /homepages/7/d355830192/htdocs/functions/functions-db.php on line 52