Is there an advantage to this hash for security?

Question

Is there any advantage to

sha1(sha1(sha1($password. $salt)));

Basically having multiple sha1 verses just one sha1

sha1($pa         


        

Answer 1

The short answer is no. When you chain two hash algorithms, all you're doing is creating another hash algorithm that has unknown properties (security-wise). Use a salt (or even better, HMAC).