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    <p>You can set your own type of validation functions. It is pretty well documented <a href="http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html#callbacks" rel="nofollow">here</a>, but an excerpt would be:</p> <pre><code>&lt;?php class Form extends CI_Controller { public function index() { $this-&gt;load-&gt;helper(array('form', 'url')); $this-&gt;load-&gt;library('form_validation'); $this-&gt;form_validation-&gt;set_rules('username', 'Username', 'callback_username_check'); $this-&gt;form_validation-&gt;set_rules('password', 'Password', 'required'); $this-&gt;form_validation-&gt;set_rules('passconf', 'Password Confirmation', 'required'); $this-&gt;form_validation-&gt;set_rules('email', 'Email', 'required|is_unique[users.email]'); if ($this-&gt;form_validation-&gt;run() == FALSE) { $this-&gt;load-&gt;view('myform'); } else { $this-&gt;load-&gt;view('formsuccess'); } } public function username_check($str) { if ($str == 'test') { $this-&gt;form_validation-&gt;set_message('username_check', 'The %s field can not be the word "test"'); return FALSE; } else { return TRUE; } } } ?&gt; </code></pre> <p><code>callback_username_check</code> is calling the <code>username_check</code> function in the controller</p> <p><strong>To answer your latest comment</strong></p> <pre><code>// $data is $_POST function my_form_validator($data) { $data = 'dont worry about this'; // you have access to $_POST here $field1 = $_POST['field1']; if($field1 OR $field2 OR $field3) { // your fields have value return TRUE; } else { // your fields dont have any value $this-&gt;form_validation-&gt;set_message('field1', 'At least one of the 3 fields should have a value'); return FALSE; } } </code></pre>
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    1. POSetting form validation rules in CodeIgniter
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    1. USMehrdad Dastgir
    1. USMehrdad Dastgir
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    1. COi don't see how do it allow 3 inputs even though only 1 of the 3 has a value
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    2. COohh so thats how it goes, imma try this one
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    3. COif thats the case, it can be passed an extra data, so where doest field2 and 3 came from? field1 is the only form name passed at the 1st params of setmessage
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