Should I have to upgrade my website to PHP MySQLi or PDO?

Question

I have designed a website before 5 years using PHP MySQL and still works fine without any issues. I heard MySQL is officially deprecated as of PHP 5.5 and has been removed a

Answer 1

PDO and MySQli both are used for database connection and both have their own advantage. In closer look PDO wins the battle but if you really stick with only one database provider then my personal best choice is use MySQLi.

You will also extract some good points from: http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059