yii2语言切换设置

语言包：

//new file
messages/zh-CN/common.php

// config

'language'=>'zh-CN',

'components' => [
        
        ...
              
        'i18n' => [
            'translations' => [
                'common' => [
                    'class' => 'yiii18nPhpMessageSource',
                    //'basePath' => '/messages',
                    'fileMap' => [
                        'common' => 'common.php',
                    ],
                ],
                'power' => [
                    'class' => 'yiii18nPhpMessageSource',
                    //'basePath' => '/messages',
                    'fileMap' => [
                        'power' => 'power.php',
                    ],
                ],
            ],
        ],
      ]

layout/site.php:

$menuRight = [
        [
            'label' => Yii::t('common', 'Language'),
            'dropDownOptions' => ['id' => 'drow-language', 'style' => 'min- 90px'],
            'items' => [
                ['label' => Yii::t('common', 'Chinese'), 'url' => ['/language/lang', 'lang' => 'zh-CN']],
                ['label' => Yii::t('common', 'English'), 'url' => ['/language/lang', 'lang' => 'en-US']],
            ]
        ],
    ];
    echo Nav::widget([
        'options' => ['class' => 'navbar-nav navbar-right'],
        'items' => $menuRight,
    ]);

controllers/LanguageController.php

<?php
namespace frontendcontrollers;

use Yii;
use yiiwebController;

class LanguageController extends Controller {

    // 多语言处理
    public function actionLang($lang)
    {
        $session = Yii::$app->session;
        $session->open();
        if (isset($lang)) {
            $session['language'] = $lang;
        }
        $this->goBack(Yii::$app->request->headers['Referer']);
    }
}

web/index.php:

$application = new yiiwebApplication($config);

$application->language = isset(Yii::$app->session['language']) ? Yii::$app->session['language'] : 'zh-CN';

$application->run();