一开始我从网上随便找了一个验证码的系统结果有bug怎么都出不来code字符串，

后来搜索了下mews captcha

效果还是很不错的，

https://github.com/mewebstudio/captcha

   >$rules= [

"code"=>'required|captcha',

"email"=>'required',

//            "name" => 'required',

"password"=>'required',

];

$messages= [

'email.required'=>'请输邮箱',

//            'name.required' => '请输入姓名',

'password.required'=>'请输入密码',

'code.required'=>'请输入验证码',

'code.captcha'=>'验证码错误，请重试'

];

$validator= Validator::make(Input::all(),$rules,$messages);

if($validator->fails()) {

returnRedirect::back()->withErrors($validator);

}else{

return"验证码OK!";

}

//

这是控制器的写法

/*t mut bit: u8;*/

>let mut buffer = [0u8; MAX_BUFFER];

while current_pos < input.len() {

flag_byte = 0;

current_buffer = 0;

for _ in 0..8 {

if current_pos >= input.len() {

buffer[current_buffer] = 0;

window[current_window] = 0;

current_buffer += 1;

current_pos += 1;//