<?php

namespace frontend\controllers;

use Yii;
use app\models\login;
use app\models\search\UserSearch;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\captcha\CaptchaAction;
/**
 * UserController implements the CRUD actions for User model.
 */
class LoginController extends Controller
{
     public function actions()
    {
        return [
            ‘error‘ => [
                ‘class‘ => ‘yii\web\ErrorAction‘,
            ],
            ‘captcha‘ => [
                ‘class‘ => ‘yii\captcha\CaptchaAction‘,
                ‘fixedVerifyCode‘ => YII_ENV_TEST ? ‘testme‘ : null,
                ‘backColor‘=>0x000000,//背景颜色
                ‘maxLength‘ => 6, //最大显示个数
                ‘minLength‘ => 5,//最少显示个数
                ‘padding‘ => 5,//间距
                ‘height‘=>40,//高度
                ‘width‘ => 130,  //宽度  
                ‘foreColor‘=>0xffffff,     //字体颜色
                ‘offset‘=>4,        //设置字符偏移量 有效果
                //‘controller‘=>‘login‘,        //拥有这个动作的controller
                            ],
        ];
    }
    public function actionIndex()
    {
        $model=new Login;
        return $this->render(‘form‘,[‘model‘=>$model]);
    }
}

<?php
namespace app\models;
use Yii;
use yii\base\Model;
class Login extends Model
{
    public $verifyCode;
    public $name;
    public $pwd;
    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            // verifyCode needs to be entered correctly
            [‘verifyCode‘, ‘captcha‘,‘message‘=>‘验证码不正确‘],
            [[‘name‘,‘pwd‘],‘required‘,‘message‘=>‘{attribute}不能为空‘]
        ];
    }
    /**
     * @return array customized attribute labels
     */
    public function attributeLabels()
    {
        return [
            ‘verifyCode‘ => ‘‘,
        ];
    }
}

<?php

use yii\helpers\Html;
use yii\widgets\ActiveForm;
use yii\captcha\Captcha;
/* @var $this yii\web\View */
/* @var $model app\models\User */
/* @var $form yii\widgets\ActiveForm */
?>

<div class="user-form">

    <?php $form = ActiveForm::begin(); ?>

    <?= $form->field($model, ‘name‘)->textInput([‘maxlength‘ => true])->label(‘姓名‘) ?>

    <?= $form->field($model, ‘pwd‘)->textInput([‘maxlength‘ => true])->label(‘密码‘) ?>
    <?= $form->field($model, ‘verifyCode‘)->widget(Captcha::className(), [
            ‘template‘ => ‘<div class="row"><div class="col-lg-2">{input}</div><div class="col-lg-2">{image}</div></div>‘,
        ])->label(‘验证码‘)  ?>

    <div class="form-group">
       <?= Html::submitButton(‘提交‘, [‘class‘=>‘btn btn-primary‘,‘name‘ =>‘submit-button‘]) ?>
        <?= Html::resetButton(‘重置‘, [‘class‘=>‘btn btn-primary‘,‘name‘ =>‘submit-button‘]) ?>
    </div>

    <?php ActiveForm::end(); ?>

</div>