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Stop Symfony from overwriting the localefrom the query string when set_locale_from_accept_language is true #3397

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Stop Symfony from overwriting the localefrom the query string when set_locale_from_accept_language is true #3397

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8 changes: 8 additions & 0 deletions src/Event/Subscriber/LocaleSubscriber.php
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,14 @@ public function onKernelRequest(RequestEvent $event): void
$locale = $request->query->get('_locale');
$request->getSession()->set('_locale', $locale);
$request->setLocale($locale);

// Symfony does not take this query parameter into account in its own subscriber.
// Symfony's listener has a lower priority and will thus be called later.
// It will not check that the locale was set already and in case useAcceptLanguageHeader
// (see https://symfony.com/doc/5.4/reference/configuration/framework.html#set-locale-from-accept-language) is set, it will
// overwrite the locale that was just set.
// @see https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php#L71
$request->attributes->set('_locale', $locale);
} elseif ($request->attributes->get('zone', false) === 'backend' && $request->getSession()->has('_backend_locale')) {
$request->setLocale($request->getSession()->get('_backend_locale'));
} else {
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