from md5 to hash sha512

[fullyloaded]

Hi,i was wondering if anyone had any idea how to change the md5 i have in my code to hash sha512? thanks.

if (md5($row["password"]) == $rememberCookiePassword){

[boen_robot]

You can't change existing hashes into a new one.Your users would have to create new passwords (which could be the same as their old passwords), which would in turn generate new hashes for you to then check.As for how to do hashing with SHA-512, see crypt().