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_escape_string() in /www/htdocs/soframiz/gallery/zen/classes.php:353 Stack trace: #0 /www/htdocs/soframiz/gallery/zen/template-functions.php(112): Album->Album(Object(Gallery), 'Rheinfall') #1 /www/htdocs/soframiz/gallery/index.php(2): require_once('/www/htdocs/sof...') #2 {main} thrown in /www/htdocs/soframiz/gallery/zen/classes.php on line 353