REGISTER:
$salt = createSalt();
$password = createPassword();
$hash = hash('sha256', $password);
$password_hash = hash('sha256', $salt . $hash);
var_dump($password,$hash,$password_hash);
OUTPUT:
string(8) "1Q6OlNio"
 string(64) "8fc18113b14a6d08ccdbb353bc8c949bf7db296789f221b0183a1fc8fcb7e4db"
 string(64) "f8fe50b60e3c71dbcc805484352b449df06b2a810cf7d93294e644093a6f60ac"

LOGIN:
$query = "SELECT Password_Hash,Salt FROM accounts WHERE Email = ' ".$email." ' ";
$result = mysqli_query($mysqli, $query);
$rows = mysqli_fetch_assoc($result);
$db_pass_hash = $rows['Password_Hash'];
$db_salt = $rows['Salt'];
$hash = hash('sha256', $password);
$password_hash = hash('sha256', $salt . $hash);                         var_dump($password,$hash,$password_hash,$db_pass_hash,$db_salt);
OUTPUT:
string(8) "1Q6OlNio"
string(64) "8fc18113b14a6d08ccdbb353bc8c949bf7db296789f221b0183a1fc8fcb7e4db"
string(64) "6dd9d91392297b73745a5b6a98150b24ef087cdb353442ff6b7986df6951b379"
string(66) " f8fe50b60e3c71dbcc805484352b449df06b2a810cf7d93294e644093a6f60ac "
string(7) " 429ce "