Laravel 5.6多语言验证：切换错误消息语言环境

Got it, let's tackle this validation message locale issue in your Laravel setup. Here's how you can make sure validation errors show up in the right language, even when submitting the contact form:

Your GET route includes the {locale} parameter to set the language, but the POST route doesn't carry this value. When the form submits and triggers validation, the app falls back to the default English locale because it can't detect the user's current language context. We'll fix this by explicitly setting the locale in your ContactFormRequest.

Option 1: Store Locale in Session (Recommended) #

This is the most reliable approach since it persists the user's language choice across their session.

1. Save the locale to the session when loading the contact form
   Update your ContactController@create method to store the active locale:

   // ContactController.php
   use Illuminate\Support\Facades\App;
   
   public function create($locale)
   {
       App::setLocale($locale);
       session()->put('active_locale', $locale); // Persist locale to session
       return view('contact');
   }
   

2. Set locale from session in your Form Request
   Add a prepareForValidation method to your ContactFormRequest to pull the locale from the session before validation runs:

   // ContactFormRequest.php
   use Illuminate\Support\Facades\App;
   
   protected function prepareForValidation()
   {
       // Use the stored locale if it exists, default to English otherwise
       if ($locale = session()->get('active_locale')) {
           App::setLocale($locale);
       }
   }
   

Option 2: Pass Locale via Hidden Form Field #

If you don't want to use sessions, you can embed the current locale directly in the form as a hidden input.

1. Add a hidden locale field to your contact form
   In your contact.blade.php view, add this field inside the form:

   <form method="POST" action="{{ route('contact.store') }}">
       @csrf
       <input type="hidden" name="locale" value="{{ App::getLocale() }}">
       <!-- Your other form fields go here -->
   </form>
   

2. Validate and set the locale in the Form Request
   Update your ContactFormRequest to read the locale from the request and apply it:

   // ContactFormRequest.php
   use Illuminate\Support\Facades\App;
   
   protected function prepareForValidation()
   {
       // Define your supported locales to prevent invalid values
       $allowedLocales = ['en', 'zh', 'fr']; // Adjust to your app's languages
       $locale = $this->input('locale', 'en');
   
       if (in_array($locale, $allowedLocales)) {
           App::setLocale($locale);
       }
   }
   
   public function rules()
   {
       return [
           'locale' => 'nullable|in:en,zh,fr', // Match your allowed locales
           // Your other validation rules
       ];
   }
   

Option 3: Parse Locale from Referrer URL #

If you can't modify the form or session, you can extract the locale from the referrer URL (the page the user came from).

Add this to your ContactFormRequest:

// ContactFormRequest.php
use Illuminate\Support\Facades\App;

protected function prepareForValidation()
{
    $referrer = $this->headers->get('referer');
    if ($referrer) {
        // Split the referrer path to get the locale segment
        $pathSegments = explode('/', trim(parse_url($referrer, PHP_URL_PATH), '/'));
        $allowedLocales = ['en', 'zh', 'fr'];

        if (isset($pathSegments[0]) && in_array($pathSegments[0], $allowedLocales)) {
            App::setLocale($pathSegments[0]);
        }
    }
}

Note: This relies on the referrer header, which isn't always guaranteed to be present, so use this as a last resort.

Important Final Check #

Make sure you've created the validation language files for each locale in resources/lang/{locale}/validation.php with all the translated error messages you need. Without these files, Laravel will still fall back to English.

内容的提问来源于stack exchange，提问作者trojan