# Class yii\i18n\GettextMessageSource

Inheritance | yii\i18n\GettextMessageSource » yii\i18n\MessageSource » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/i18n/GettextMessageSource.php

GettextMessageSource represents a message source that is based on GNU Gettext.

Each GettextMessageSource instance represents the message translations for a single domain. And each message category represents a message context in Gettext. Translated messages are stored as either a MO or PO file, depending on the $useMoFile property value.

All translations are saved under the $basePath directory.

Translations in one language are kept as MO or PO files under an individual subdirectory whose name is the language ID. The file name is specified via $catalog property, which defaults to 'messages'.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$basePath | string |  | yii\i18n\GettextMessageSource
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$catalog | string |  | yii\i18n\GettextMessageSource
$forceTranslation | boolean | Whether to force message translation when the source and target languages are the same. | yii\i18n\MessageSource
$sourceLanguage | string | The language that the original messages are in. | yii\i18n\MessageSource
$useBigEndian | boolean |  | yii\i18n\GettextMessageSource
$useMoFile | boolean |  | yii\i18n\GettextMessageSource

## Public Methods

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Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\Component
__clone() | This method is called after the object is created by cloning an existing one. | yii\base\Component
__construct() | Constructor. | yii\base\BaseObject
__get() | Returns the value of a component property. | yii\base\Component
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component
__set() | Sets the value of a component property. | yii\base\Component
__unset() | Sets a component property to be null. | yii\base\Component
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
detachBehavior() | Detaches a behavior from the component. | yii\base\Component
detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component
ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component
hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component
init() | Initializes this component. | yii\i18n\MessageSource
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
translate() | Translates a message to the specified language. | yii\i18n\MessageSource
trigger() | Triggers an event. | yii\base\Component

## Protected Methods

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Method | Description | Defined By
--- | --- | ---
getMessageFilePath() | Returns message file path for the specified language and category. | yii\i18n\GettextMessageSource
loadFallbackMessages() | The method is normally called by loadMessages() to load the fallback messages for the language. | yii\i18n\GettextMessageSource
loadMessages() | Loads the message translation for the specified $language and $category. | yii\i18n\GettextMessageSource
loadMessagesFromFile() | Loads the message translation for the specified language and category or returns null if file doesn't exist. | yii\i18n\GettextMessageSource
translateMessage() | Translates the specified message. | yii\i18n\MessageSource

## Events

Hide inherited events

Event | Type | Description | Defined By
--- | --- | --- | ---
EVENT_MISSING_TRANSLATION | yii\i18n\MissingTranslationEvent | An event that is triggered when a message translation is not found. | yii\i18n\MessageSource

## Constants

Hide inherited constants

Constant | Value | Description | Defined By
--- | --- | --- | ---
MO_FILE_EXT | '.mo' |  | yii\i18n\GettextMessageSource
PO_FILE_EXT | '.po' |  | yii\i18n\GettextMessageSource

## Property Details

$basePath public property
public string $basePath = '@app/messages'
$catalog public property
public string $catalog = 'messages'
$useBigEndian public property
public boolean $useBigEndian = false
$useMoFile public property
public boolean $useMoFile = true

## Method Details

getMessageFilePath() protected method

Returns message file path for the specified language and category.

protected string getMessageFilePath ( $language )
$language | string | The target language
return | string | Path to message file

loadFallbackMessages() protected method (available since version 2.0.7)

The method is normally called by loadMessages() to load the fallback messages for the language.

Method tries to load the $category messages for the $fallbackLanguage and adds them to the $messages array.

protected array loadFallbackMessages ( $category, $fallbackLanguage, $messages, $originalMessageFile )
$category | string | The message category
$fallbackLanguage | string | The target fallback language
$messages | array | The array of previously loaded translation messages. The keys are original messages, and the values are the translated messages.
$originalMessageFile | string | The path to the file with messages. Used to log an error message in case when no translations were found.
return | array | The loaded messages. The keys are original messages, and the values are the translated messages.

loadMessages() protected method

Loads the message translation for the specified $language and $category.

If translation for specific locale code such as `en-US` isn't found it tries more generic `en`. When both are present, the `en-US` messages will be merged over `en`. See loadFallbackMessages() for details. If the $language is less specific than $sourceLanguage, the method will try to load the messages for $sourceLanguage. For example: $sourceLanguage is `en-GB`, $language is `en`. The method will load the messages for `en` and merge them over `en-GB`.

See also:

- loadFallbackMessages()
- $sourceLanguage

protected array loadMessages ( $category, $language )
$category | string | The message category
$language | string | The target language
return | array | The loaded messages. The keys are original messages, and the values are translated messages.

loadMessagesFromFile() protected method

Loads the message translation for the specified language and category or returns null if file doesn't exist.

protected array|null loadMessagesFromFile ( $messageFile, $category )
$messageFile | string | Path to message file
$category | string | The message category
return | array|null | Array of messages or null if file not found