Should I use a hashed password for a confirmation code on new user accounts

[HGeneAnthony]

I'm working on a new user submission form and I was wondering whether it's safe to send a confirmation letter to the user using their hashed password as their confirmation code?  Since this is a hashed password it can't be decrypted (I believe), the password is useless because it's always hashed before login so it can't be used to login to the system, it's only being emailed to the user who's account is tied to the account, and it would save me the option of having to store a confirmation code field in my DB.  Is this safe? 

[JasonLewis]

I generally just generate a random confirmation code like you mentioned. Only takes a couple extra lines of code.

[jonsjava]

I would do something like this

function genURL($id,$uname){
   $salt = rand(0,94821);
   return base_convert($id.$uname.$salt,34,16);
}

Then, store the result in your database as verification key.