What is md5() for?

Question

I was reading this tutorial for a simple PHP login system.

In the end it recommends that you should encrypt your password using md5().

Though I know this is a be

Answer 1

This is my question about the aspects of md5 collision, slightly related to your question:

Is there any difference between md5 and sha1 in this situation?

The important part is in the first 3 rows, that is: you must put your salt before the password, if you want to achieve stronger protection, not after.