Codeigniter Captcha Verification using session - An Easy method
Register function
function register() {
$this->form_validation->set_rules('txtzip', 'Zipcode', 'trim|required|xss_clean');
$this->form_validation->set_rules('captchafld', 'Submit the word you see below', 'required|callback_captcha_check');
if ($this->form_validation->run() == FALSE) {
$aCaptchaCfg = array(
// 'word' => 'myrandomword', //default: random()
'length' => 6, //default: 5
'img_path' => './captcha/', //no default !
'img_url' => site_url() . 'captcha/', // no default!
'font_path' => site_url() . './system/fonts/', // default: ./system/fonts/
'fonts' => array('texb.ttf', 'TSCu_Comic.ttf'), // default: texb.ttf
'font_size' => 25, // default: 18
'img_width' => '180', // default: 170
'img_height' => '60', // default: 60
'expiration' => 7200 // default: 7200
);
$data['aCaptcha'] = create_captcha($aCaptchaCfg);
$this->session->set_userdata("captchaval",$data['aCaptcha']['word']);
$this->load->view($path.'account_signup', $data);
}
}
else {
// do the action
}
}
call back function
function captcha_check($str) {
$captcha_val = $this->session->userdata("captchaval");
if ($captcha_val != $str) {
$this->form_validation->set_message('captcha_check', 'Wrong verification number submission');
return FALSE;
} else
return TRUE;
}
Displaying captcha image in the view file
<label>Verification</label><?php
echo $aCaptcha['image'];
echo '<input type="text" name="captchafld" value="" />';
?>
