$messagePath public property Required, root directory containing message translations. public string $messagePath = '@yii/messages'

$markUnused public property Whether to mark messages that no longer appear in the source code. Defaults to true, which means each of these messages will be enclosed with a pair of '@@' marks. public boolean $markUnused = true

$languages public property Required, list of language codes that the extracted messages should be translated to. For example, ['zh-CN', 'de']. public array $languages = []

$ignoreCategories public property Message categories to ignore. For example, 'yii', 'app*', 'widgets/menu', etc. See also isCategoryIgnored(). public array $ignoreCategories = []

$format public property Generated file format. Can be "php", "db" or "po". public string $format = 'php'

$except public property List of patterns that specify which files/directories should NOT be processed. If empty or not set, all files/directories will be processed. See helpers/FileHelper::findFiles() description for pattern matching rules. If a file/directory matches both a pattern in "only" and "except", it will NOT be processed. public array $except = ['.svn', '.git', '.gitignore', '.gitkeep', '.hgignore', '.hgkeep', '/messages', '/BaseYii.php']

$defaultAction public property Controller default action ID. public string $defaultAction = 'extract'

$db public property Connection component ID for "db" format. public string $db = 'db'

$catalog public property Name of the file that will be used for translations for "po" format. public string $catalog = 'messages'

validateControllerClass() protected method Validates if the given class is a valid console controller class. protected boolean validateControllerClass ( $controllerClass )$controllerClass string