YII Framework框架教程之国际化实现方法

/*** Translates a message to the specified language.* Starting from version 1.0.2, this method supports choice format (see {@link CChoiceFormat}),* i.e., the message returned will be chosen from a few candidates according to the given* number value. This feature is mainly used to solve plural format issue in case* a message has different plural forms in some languages.* @param string $category message category. Please use only word letters. Note, category 'yii' is* reserved for Yii framework core code use. See {@link CPhpMessageSource} for* more interpretation about message category.* @param string $message the original message* @param array $params parameters to be applied to the message using <code>strtr</code>.* Starting from version 1.0.2, the first parameter can be a number without key.* And in this case, the method will call {@link CChoiceFormat::format} to choose* an appropriate message translation.* Starting from version 1.1.6 you can pass parameter for {@link CChoiceFormat::format}* or plural forms format without wrapping it with array.* @param string $source which message source application component to use.* Defaults to null, meaning using 'coreMessages' for messages belonging to* the 'yii' category and using 'messages' for the rest messages.* @param string $language the target language. If null (default), the {@link CApplication::getLanguage application language} will be used.* This parameter has been available since version 1.0.3.* @return string the translated message* @see CMessageSource*/public static function t($category,$message,$params=array(),$source=null,$language=null){

Yii::t('app', 'Path alias "{alias}" is redefined.',  array('{alias}'=>$alias))