[辅助方法 Helper] 分享一个组装的验证码比CI自带的好看

function verify(){
$this->load->helper('captcha');
$vals = array (
'img_path' => './captcha/',
'img_url' => base_url().'captcha/',
'word' =>'',
'expiration' => 30,
);
$cap = create_captcha($vals);
echo $cap['image'];
$this->session->set_userdata('verify',$cap['word']);
var_dump ($this->session->userdata('verify'));
}