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Login Validation

Is there a cleaner way to use the Validation class to check two fields to see if they are valid together?

At the moment I do something like the following:
$rules['username'] = 'trim|required';
$rules['password'] = 'trim|required|callback__check_combo|sha1';

function _check_combo($val)
  // There are some DB calls usually but for the sake of
  // simplicity im just going to type it out
  if ($this->input->post('username') == 'bob' && sha1($val) == 'cow')
    return TRUE;

  return FALSE;

I was wondering if there was a cleaner way to do this? Because atm I'm trusting the the username validation will be done first. And other than that, if there is a problem with username, it will still call the _check_combo function (as it should), but I don't want it to work this way.

Thank you

try to see if [url="http://ellislab.com/forums/viewthread/55818/"]this discussion[/url] is of any help

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