The language resolution is based on the user preferred languages and the languages
supported by the application. The method will try to find the best match.
| public getPreferredLanguage ( array $languages = [] ) : string | ||
| $languages | array | a list of the languages supported by the application. If this is empty, the current application language will be returned without further processing. |
| return | string | the language that the application should use. |
public function testPrefferedLanguage()
{
$this->mockApplication(['language' => 'en']);
$request = new Request();
$request->acceptableLanguages = [];
$this->assertEquals('en', $request->getPreferredLanguage());
$request = new Request();
$request->acceptableLanguages = ['de'];
$this->assertEquals('en', $request->getPreferredLanguage());
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de', 'ru-RU'];
$this->assertEquals('en', $request->getPreferredLanguage(['en']));
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de', 'ru-RU'];
$this->assertEquals('de', $request->getPreferredLanguage(['ru', 'de']));
$this->assertEquals('de-DE', $request->getPreferredLanguage(['ru', 'de-DE']));
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de', 'ru-RU'];
$this->assertEquals('de', $request->getPreferredLanguage(['de', 'ru']));
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de', 'ru-RU'];
$this->assertEquals('ru-ru', $request->getPreferredLanguage(['ru-ru']));
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de'];
$this->assertEquals('ru-ru', $request->getPreferredLanguage(['ru-ru', 'pl']));
$this->assertEquals('ru-RU', $request->getPreferredLanguage(['ru-RU', 'pl']));
$request = new Request();
$request->acceptableLanguages = ['en-us', 'de'];
$this->assertEquals('pl', $request->getPreferredLanguage(['pl', 'ru-ru']));
}
