I've seen this information in other articles but most were salting with a known value (like a username). Is salting a password with the
Salt with a truly random salt instead. Guessing a date based salt seems a little too easy, especially if someone is aware how long the person has been a member of the site.
You could do something like:
$salt = substr(sha1(uniqid(mt_rand(), true)), 0, 16);