图9
1、i18n 应用组件的配置代码如下：
'components' => [
'i18n' => [
'translations' => [
'model/*' => [
'class' => 'yii\i18n\PhpMessageSource',
'forceTranslation' => true,
'basePath' => '@common/messages',
],
'*' => [
'class' => 'yii\i18n\PhpMessageSource',
'forceTranslation' => true,
'basePath' => '@app/messages',
'fileMap' => [
'app' => 'app.php',
'error' => 'error.php',
'success' => 'success.php',
],
],
],
],
],
2、在 Postman 中请求接口，Headers 中，Accept-Language:zh-CN，当目标语言为简体中文，文件映射的类别名为：success 时，被映射到 PHP 文件 @app/messages/zh-CN/success.php，如图1
return ['code' => 10000, 'message' => Yii::t('success', '127016'), 'data' => ['items' => array_values($models)]];
3、在 Postman 中请求接口，Headers 中，Accept-Language:zh-CN，当目标语言为简体中文，文件映射的类别名为：app 时，被映射到 PHP 文件 @app/messages/zh-CN/app.php，如图2
$planLog->opinion = Yii::t('app', Yii::t('app', Yii::t('app', 302016), ['accepted_group_name' => $acceptedGroupName, 'accepted_user_nick' => $identity->user_nick]));
4、在 Postman 中请求接口，Headers 中，Accept-Language:en-US，当目标语言为美国英语，文件映射的类别名为：success 时，被映射到 PHP 文件 @app/messages/en-US/success.php，如图3
5、在 Postman 中请求接口，Headers 中，Accept-Language:en-US，当目标语言为美国英语，文件映射的类别名为：app 时，未被映射到 PHP 文件 @app/messages/en-US/app.php，要翻译的信息在语言文件中未找到，会返回原始未翻译的信息，即：302011。如图4
6、编辑 E:\wwwroot\pcs-api\vendor\yiisoft\yii2\i18n\MessageSource.php，当目标语言为简体中文，响应：11， 当目标语言为美国英语，响应：21，即当目标语言为美国英语，文件映射的类别名为：app 时，跳过了翻译指定的消息的步骤。如图5、图6
Yii::t('app', '302011');
exit;
public function translate($category, $message, $language)
{
if ($this->forceTranslation || $language !== $this->sourceLanguage) {
echo 1;
exit;
return $this->translateMessage($category, $message, $language);
}
echo 2;
exit;
return false;
}
7、当目标语言为美国英语，文件映射的类别名为：app 时，$this->forceTranslation 的值为 false，如图7
public function translate($category, $message, $language)
{
var_dump($this->forceTranslation);
exit;
if ($this->forceTranslation || $language !== $this->sourceLanguage) {
echo 1;
exit;
return $this->translateMessage($category, $message, $language);
}
echo 2;
exit;
return false;
}
8、当目标语言为美国英语，文件映射的类别名为：success 时，$this->forceTranslation 的值为 true，如图8
Yii::t('success', '302011');
exit;
9、查看 \vendor\yiisoft\yii2\i18n\I18N.php，文件映射的类别名：yii、app，始终定义类别 yii 和 app 。前者指的是 Yii 核心中使用的消息框架代码，而后者是指自定义应用程序代码的默认消息类别。其判断类别：app 是否存在，如果不存在，则覆盖，但是，其判断的层级仅为第一级，没有深入至更深的层级，因此，自定义的类别：app 会被覆盖，如图9
/**
* @var array list of [[MessageSource]] configurations or objects. The array keys are message
* category patterns, and the array values are the corresponding [[MessageSource]] objects or the configurations
* for creating the [[MessageSource]] objects.
*
* The message category patterns can contain the wildcard `*` at the end to match multiple categories with the same prefix.
* For example, `app/*` matches both `app/cat1` and `app/cat2`.
*
* The `*` category pattern will match all categories that do not match any other category patterns.
*
* This property may be modified on the fly by extensions who want to have their own message sources
* registered under their own namespaces.
*
* The category `yii` and `app` are always defined. The former refers to the messages used in the Yii core
* framework code, while the latter refers to the default message category for custom application code.
* By default, both of these categories use [[PhpMessageSource]] and the corresponding message files are
* stored under `@yii/messages` and `@app/messages`, respectively.
*
* You may override the configuration of both categories.
*/ public $translations;
/**
* Initializes the component by configuring the default message categories.
*/ public function init()
{
parent::init();
if (!isset($this->translations['yii']) && !isset($this->translations['yii*'])) {
$this->translations['yii'] = [
'class' => 'yii\i18n\PhpMessageSource',
'sourceLanguage' => 'en-US',
'basePath' => '@yii/messages',
];
}
if (!isset($this->translations['app']) && !isset($this->translations['app*'])) {
$this->translations['app'] = [
'class' => 'yii\i18n\PhpMessageSource',
'sourceLanguage' => Yii::$app->sourceLanguage,
'basePath' => '@app/messages',
];
}
}
10、解决方案如下，文件映射的类别名：app 调整为 application，被映射到 PHP 文件 application.php，调整 i18n 应用组件的配置代码如下：
'components' => [
'i18n' => [
'translations' => [
'model/*' => [
'class' => 'yii\i18n\PhpMessageSource',
'forceTranslation' => true,
'basePath' => '@common/messages',
],
'*' => [
'class' => 'yii\i18n\PhpMessageSource',
'forceTranslation' => true,
'basePath' => '@app/messages',
'fileMap' => [
'application' => 'application.php',
'error' => 'error.php',
'success' => 'success.php',
],
],
],
],
],
11、重命名文件 \common\messages\en-US\app.php 为 \common\messages\en-US\application.php，重命名文件 \common\messages\zh-CN\app.php 为 \common\messages\zh-CN\application.php，重命名文件 \api\messages\en-US\app.php 为 \api\messages\en-US\application.php，重命名文件 \api\messages\zh-CN\app.php 为 \api\messages\zh-CN\application.php。其他应用目录下皆如此操作。将 Yii::t(‘app’, 批量替换为：Yii::t(‘application’, 。如图10
重命名文件 \common\messages\en-US\app.php 为 \common\messages\en-US\application.php，重命名文件 \common\messages\zh-CN\app.php 为 \common\messages\zh-CN\application.php，重命名文件 \api\messages\en-US\app.php 为 \api\messages\en-US\application.php，重命名文件 \api\messages\zh-CN\app.php 为 \api\messages\zh-CN\application.php。其他应用目录下皆如此操作。将 Yii::t(‘app’, 批量替换为：Yii::t(‘application’,
12、当目标语言为美国英语，文件映射的类别名为：application 时，已被映射到 PHP 文件 @app/messages/en-US/application.php，如图11
