Yii 环境区分及配置文件

<?php

$configDev = [];
if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
    ];

    $configDev['modules']['gii'] = [
        'class' => 'yii\gii\Module',
    ];
}

$config = [
    'id' => 'app-backend',
    'basePath' => dirname(__DIR__),
    'controllerNamespace' => 'backend\controllers',
    'vendorPath' => dirname(dirname(__DIR__)) . '/vendor',
    'bootstrap' => ['log'],
    'aliases' => [
        '@bower' => '@vendor/bower-asset',
        '@npm'   => '@vendor/npm-asset',
    ],
    'modules' => [
        'admin' => [
            'class' => 'backend\modules\admin\Module',
        ],
        'wap' => [
            'class' => 'backend\modules\wap\Module',
        ],
         'api' => [
            'class' => 'backend\modules\api\Module',
        ],

    ],
    'components' => [
        'cache' => [
            'class' => 'yii\caching\FileCache',
        ],
        'request' => [
            'csrfParam' => '_csrf-backend',
            'cookieValidationKey' => 'RJZsl6OS-rbSj6Pk6-Mb5877I1vf0Izy',
        ],
        'user' => [
            'identityClass' => 'backend\models\SuperUser',
            'enableAutoLogin' => true,
            'identityCookie' => ['name' => '_identity-backend', 'httpOnly' => true],
        ],
        'session' => [
            // this is the name of the session cookie used for login on the backend
            'name' => 'advanced-backend',
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=db_test1',
            'username' => 'root',
            'password' => 'root',
            'charset' => 'utf8',
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'viewPath' => '@common/mail',
            // 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,
        ],
         'urlManager' => [
            'enablePrettyUrl' => true, //这个表示开启url美化
            'showScriptName' => false, //这个字段表示不显示文件类型的名称，如.php或者.html
           // 'suffix' => '.html' //这个字段表示后缀
        ],
    ],
    'params' =>[
        'adminEmail' => 'admin@example.com',
        'supportEmail' => 'support@example.com',
        'user.passwordResetTokenExpire' => 3600,
    ],
];


return  yii\helpers\ArrayHelper::merge(
            $config,
            $configDev
        );