How can I make this more secure?

Question

I am making a login system in PHP and I was wondering if this current hash function I have is secure enough.

public function genHash( $user, $pass )
{
    $user = strtoupper($user);
    $staticSalt  = $this->staticSalt;
    $dynamicSalt = hash('SHA512', md5($user . $pass) . sha1($pass) . hash('SHA512', $user . $pass));
    $final       = hash('WHIRLPOOL', $pass . $dynamicSalt . $staticSalt);
    return $final;
}

The static salt is just a bunch of random characters. Anyway, how can I make it more secure?

Answer 1

You could use different salts for each user and store them in the database but besides that this system looks pretty secure. (Not knowing the details of the server).

EDIT:

Theoretically multihashing a string increases the chance of hash collisions but I haven't found anything reliable that says this is a practical risk.