You must to configure if your version of PHP is by far the difference is that embedded MySQL is obsolete, since PHP 5.5.0 for. This means that PHP has removed support for MySQL and MySQLi or transient PDO_MYSQL (). Problems of the same (more or less), PHP around a little bit different. However, as I said, PHP does not support MySQL in the future, and if you can make a choice between what to use, I recommend you go with a promising option. Personally, I worked on the project was too far in MySQL before I learned that you should not use. So I'm using MySQL, but I also converted.