php - How to validate a form in codeigniter -

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i using code igniter 2.1.0 ad trying validate form(though form found homepage of website), have followed documentation on not seem work expected.each time include library page re arranges itself. please 1 tell me wrong.beow portion of page trying vaidate.

<?php echo validation_errors(); ?> <form id="signup" action="" method="get">     <label>         username:<input type="text" name="username" value="" size="31"/>     </label>     <br>     <label>         email:<input type="text" name="email" values="" size="31"/>     </label>     <br>     <label>         password:<input name="password" type="password" value="" size="31"/>     </label>     <br>     <label>         confirm password:<input name="passcon" type="password" value="" size="31"/>     </label>     <br>     <label>         date of birth:<input type="date" name="dob" value="" size="31" />     </label>     <br>     <input type="radio" name="sex" value="male" /> male<br />     <input type="radio" name="sex" value="female" /> female     <br>       <input id="button" type="submit" value="signup" /> </form>

first must include form_validation library controller:

$this->load->library('form_validation');

second need specify restrictions:

$this->form_validation->set_rules('username','username','required|trim|minlength[6]'); $this->form_validation->set_rules('password','password','required'); etc..

third need submit form in case of every thing went correctly:

if($this->form_validation->run()){    // requirement met }else{    // not requirement met }

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