Since i found an information that PHP's MySQL extension has some potential security weaknesses and it's preety old, should i not bother with learning it and just check out PDO and MySQLi extension?
Is there any real difference between them?
Will learning all three give me benefit or is it enough to learn just one, or two of them?
What do they differ from, except that one is procedural, and the other is OO (the 2nd and 3rd extension i mean).