输出缩略图
null Core_Controller_Captcha::action_default( )
public function action_default($type='')
{
$width = 80;
$height = 30;
if ($type && preg_match('#^([0-9]+)x([0-9]+)\.png$#i', $type,$m))
{
if ($m[1]>0)$width = $m[1];
if ($m[1]>0)$height = $m[2];
}
Captcha::render(array('width'=>$width,'height'=>$height));
}