Laravel 5.7升级至5.8后出现RouteFileRegistrar::get()未定义方法错误求助

Hey there, let's work through this frustrating upgrade issue you're hitting. That Call to undefined method Illuminate\Routing\RouteFileRegistrar::get() error is a clear sign your Debian server's upgrade didn't fully complete, and there's a mix of old and new Laravel files (or a PHP version mismatch) causing the problem. Your local WAMP setup worked because it likely has the right PHP version and no file locking issues—let's fix the server side step by step.

First: Check Your PHP Version #

Laravel 5.8 requires PHP 7.1.3 or higher, but Debian 9 ships with PHP 7.0 by default. If your server is still on PHP 7.0, that's a major reason the upgrade failed (even if Composer downloaded the files, PHP can't run the newer Laravel code properly).

Run this to check your version:

php -v

If it's below 7.1.3, you'll need to upgrade PHP first—add the Sury PHP repo to Debian 9 and install PHP 7.4 (a stable choice for Laravel 5.8) before proceeding.

Step-by-Step Fix #

1. Stop services to avoid file locks
   Nginx and PHP-FPM might be holding onto old vendor files, so shut them down first:

   sudo systemctl stop nginx php7.4-fpm  # Adjust the PHP version to match your upgraded one
   

2. Wipe old dependencies and lock file
   Remove the existing vendor directory and composer.lock to ensure a completely fresh install:

   rm -rf vendor
   rm composer.lock
   

3. Clear Laravel and PHP caches
   Old cached code can cause weird class loading issues. If you can still run artisan, clear these:

   php artisan cache:clear
   php artisan config:clear
   php artisan route:clear
   php artisan view:clear
   

   Even if artisan throws errors right now, restarting PHP-FPM will reset OPcache (which caches PHP class files):

   sudo systemctl restart php7.4-fpm
   

4. Update Composer and reinstall dependencies
   Outdated Composer can cause upgrade glitches. Update it first, then do a fresh install:

   composer self-update
   composer install --no-dev  # Use --no-dev for pre-release/production environments
   

   Watch the output closely—if there are dependency conflicts, resolve them before moving on.

5. Restart services and finalize the upgrade
   Bring Nginx and PHP-FPM back up, then run Laravel's post-upgrade commands:

   sudo systemctl start nginx php7.4-fpm
   php artisan migrate --force  # --force skips confirmation for pre-release/production
   php artisan route:cache
   

Why This Happened #

That RouteFileRegistrar error occurs when the class file from Laravel 5.7 wasn't replaced with the 5.8 version (which includes the get() method and other HTTP verb helpers). This can happen due to file locks from running services, outdated PHP causing partial installs, or cached code loading old classes instead of the new ones.

内容的提问来源于stack exchange，提问作者Boyan