title: keep argument in url with codeigniter
body: <p>I am probably just not understanding how this really works, but i want to keep the argument in the URL with codeigniter. 
  I have a form that has the url ../dashboard/edit_member/33 where dashboard is my controller and edit_member is my method and 33 is the ID of the member i am editing.
  So when i hit submit and go through my form validation etc.. i use </p>
  
  <pre><code>public function edit_member($id = NULL) {
  
      $this-&gt;load-&gt;library("form_validation");
  
      $data['member'] = $this-&gt;User-&gt;get_user($id);
  
      if($this-&gt;input-&gt;post('submit')) { 
          if($this-&gt;update_profile() == True) { 
              $data['message'] = 'Profile updated';
          } else {
              $data['message'] = 'There was a problem updating your record';
          }
      } 
  
      $this-&gt;load-&gt;view("edit_member", $data);        
  }
  </code></pre>
  
  <p>But my issue is when its submitted, it comes back to ../dashboard/edit_member with no id attached to it anymore... </p>
  
  <p>Am i missing something? </p>
  
  <p>Thanks</p>