问题：

Site控制器里面的action如何访问？如图：

解决方法：

1、建立目录

首先建立如上的目录结构，在api下的以及目录有三个文件夹和一个文件Module.php，这个php文件内容如下：

<?php

namespace app\modules\api;

/**
 * api module definition class
 */
class Module extends \yii\base\Module
{
    /**
     * @inheritdoc
     */
    public $controllerNamespace = 'app\modules\api\controllers';

    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();

        // custom initialization code goes here
    }
}

（推荐教程：yii框架）

2、web.php

还记得项目根目录下的config文件夹下有个web.php文件么，添加如下字段：

Yii Framework 2.0.51

Yii Framework 2.0.51 官方 Basic 应用模板，适合旧项目兼容、升级验证和开发测试。

下载

<?php

$params = require __DIR__ . '/params.php';
$db = require __DIR__ . '/db.php';

$config = [
    'id' => 'basic',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'aliases' => [
        '@bower' => '@vendor/bower-asset',
        '@npm'   => '@vendor/npm-asset',
    ],
    'components' => [
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => 'jjsYJ_ju0W8ifOv5mY3JBMI6DOppFlo6',
        ],
        'cache' => [
            'class' => 'yii\caching\FileCache',
        ],
        'user' => [
            'identityClass' => 'app\models\User',
            'enableAutoLogin' => true,
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.
            'useFileTransport' => true,
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'db' => $db,
        /*
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'rules' => [
            ],
        ],
        */
    ],
    'modules' => [
        'api' => [
            'class' => 'app\modules\api\Module',
        ],
    ],
    'params' => $params,
];

if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
        // uncomment the following to add your IP if you are not connecting from localhost.
        //'allowedIPs' => ['127.0.0.1', '::1'],
    ];

    $config['bootstrap'][] = 'gii';
    $config['modules']['gii'] = [
        'class' => 'yii\gii\Module',
        // uncomment the following to add your IP if you are not connecting from localhost.
        //'allowedIPs' => ['127.0.0.1', '::1'],
    ];
}

return $config;

3、api组件下的controllers

现在我们在Modules/api/controllers下新建一个SiteControllers.php,内容如下：

<?php

namespace app\modules\api\controllers;

use yii\web\Controller;


class SiteController extends Controller
{
    public function actionIndex()
    {
        echo "hello world";
    }
}

4、浏览器访问

最后就是浏览器访问这个actionIndex了，浏览器输入： http://localhost/basic/web/index.php?r=api/site/index

完成！

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