title: can I add array to where clause to update_batch in codeigniter
body: <p>I am using codeigniter <code>update_batch</code> function.</p>
  
  <p>I want to pass an array as the third parameter (where clause) to <code>update_batch</code>.</p>
  
  <pre><code>$data = array(
     array(
        'title' =&gt; 'My title' ,
        'name' =&gt; 'My Name 2' ,
        'date' =&gt; 'My date 2'
     ),
     array(
        'title' =&gt; 'Another title' ,
        'name' =&gt; 'Another Name 2' ,
        'date' =&gt; 'Another date 2'
     )
  );
  </code></pre>
  
  <p>Instead of this:</p>
  
  <pre><code>$this-&gt;db-&gt;update_batch('mytable', $data, 'title'); 
  </code></pre>
  
  <p>I want to do this:</p>
  
  <pre><code> $this-&gt;db-&gt;update_batch('mytable', $data, array('title','name')); 
  </code></pre>
  
  <p>So multiple where conditions added.</p>
  
  <p>Is this possible?</p>