$rst=$this->check_verify(I('post.yzm'));
if($rst===false){
$this->error('验证码错误',U('Tpl/Login/index'),2);
}public function yzm(){
$Verify = new \Think\Verify();
$Verify->fontSize = 30;
$Verify->length = 4;
$Verify->useNoise = false;
$Verify->entry();
}
// 检测输入的验证码是否正确，$code为用户输入的验证码字符串
public function check_verify($code, $id = ''){
$verify = new \Think\Verify();
return $verify->check($code, $id);
}