Laravel app stopped working after upgrading to php 8

Stefan Izdrail

Founder & Senior Architect · 2026-06-29

Laravel Company
Title: Troubleshooting Laravel App Compatibility Issues after Upgrading to PHP 8 Body: Upgrading your PHP version can be a daunting task, and ensuring that your existing apps are compatible with the new environment requires due diligence. In this comprehensive blog post, we'll discuss the problems you may encounter when upgrading from an older PHP version to PHP 8 and explore solutions to tackle them effectively. 1. Understand Your App Compatibility Issues: The first step in addressing these issues is understanding the reasons behind their occurrence. In the given error message, we can see that the deprecated method ReflectionParameter::getClass() is being called multiple times and causing errors. This means there's either a bug within your app or an outdated dependency. 2. Update Laravel Version: Ensure you are using the latest version of Laravel, as newer updates may resolve these issues and make your app more compatible with PHP 8. Stay updated by checking the official Laravel documentation or following their release blog posts on https://laravelcompany.com/. 3. Update Dependencies: If updating Laravel doesn't fix the issue, check if any of your dependencies are causing compatibility problems. Review the installed packages and update those that require PHP 8 support. For help with dependency management, refer to popular tooling like Composer or GitHub Actions. 4. Run Code Sniffer: If updating Laravel doesn't solve the problem and the dependencies are up-to-date, consider running a code sniffer like PHPCS (https://php-cs-fixer.readthedocs.io/en/latest/) to identify potential issues within your application. This tool can help you spot compatibility problems that may have slipped through code reviews or testing. 5. Test and Fix Errors: Once you've identified the problematic areas, it's time to fix them. Replace deprecated methods with their replacements, if available, or refactor your code to avoid using those functions altogether. It's essential to ensure that your updated code remains maintainable and readable. 6. Stay Updated on PHP Versions: Keep an eye on the latest PHP updates and release notes. By staying informed about new features and changes in syntax and functionality, you can better prepare your apps for future upgrades and avoid compatibility issues. This will also help prevent common mistakes when upgrading to newer versions. 7. Seek Help from Experts: If all else fails and you require further assistance with Laravel app compatibility issues after updating to PHP 8, consider reaching out to professional developers or consultants at https://laravelcompany.com/. They can provide expert advice on tackling these issues and ensuring your application works smoothly across various PHP versions. In summary, addressing Laravel app compatibility issues after upgrading to PHP 8 requires a combination of updating dependencies, fixing deprecated methods, and staying informed about the latest releases and best practices. By following these steps, you can maintain an efficient and future-proofed Laravel application that doesn't let you down when new PHP versions are released!