image

"require":{
    "gregwar/captcha":"1.*"
},

执行:composer update
使用:引入命名空间
use Gregwar\Captcha\CaptchaBuilder;
use Gregwar\Captcha\PhraseBuilder;
以下例子:
注意:应该把验证码路由放在中间件外面Route::get('/captcha/{tmp}');

//生成验证码方法
public function captcha($tmp)
{
    $phrase = new PhraseBuilder;
    //设置验证码位数
    $code = $phrase->build(4);
    //生成验证码图片的Builder对象，配置相应属性
    $builder = new CaptchaBuilder($code, $phrase);
    //设置背景颜色
    $builder->setBackgroundColor(123, 203, 230);
    $builder->setMaxAngle(25);
    $builder->setMaxBehindLines(0);
    $builder->setMaxFrontLines(0);
    //可以设置图片宽高及字体
    $builder->build($width = 90, $height = 35, $font = null);
    // 获取验证码的内容
    $phrase = $builder->getPhrase();
    //把内容存入session
    \Session::flash('code', $phrase);
    //生成图片
    header("Cache-Control: no-cache, must-revalidate");
    header("Content-Type:image/jpeg");
    $builder->output();
}

模板案例

<input name="captcha" type="text" placeholder="验证码">  
    <a onclick="javascript:re_captcha();">  
<img src="{{ URL('/code/captcha/1') }}" id="captchaid">

点击图片更换验证码JS

<script type="text/javascript">  
    function re_captcha() {  
        $url = "{{ URL('/code/captcha') }}";
        $url = $url + "/" + Math.random();
        document.getElementById('captchaid').src = $url;
    }
</script>

内容来源:吕倡个人博客