Warning: mysql_real_escape_string(): Access denied for user 'nobody'@'localhost'

$set = "SET `title`= '".mysql_real_escape_string($title)."', `catalog`= '".mysql_real_escape_string($catalog)."', `description` = '".mysql_real_escape_string($description)."', `image` = '".$filename."'"; 
           

錯誤：

Warning: mysql_real_escape_string(): Access denied for user 'nobody'@'localhost' (using password: NO) in /home/markbad/public_html/includes/content_generator.php on line 20
           

解決方法：

You must do a successful mysql_connect() before you can use this function.