title: How to set custom error message with form_validation And CodeIgniter
body: <p>i am newbie in CodeIgniter...and i am trying to do form validation for array input...
  the array name is pages[].</p>
  
  <p>and i wrote:</p>
  
  <pre><code>$this-&gt;form_validation-&gt;set_rules('pages[]','','required');
  </code></pre>
  
  <p>if i use that:</p>
  
  <pre><code>$this-&gt;form_validation-&gt;set_message('required', 'you not selected pages.');
  </code></pre>
  
  <p>it will not change the other "required" validation input params?</p>
  
  <p>So how can i set error message only for one validation?</p>