执行Composer Update时Laravel依赖ext-mbstring缺失报错的解决方案

Hey there, let's get this sorted out quickly. The error you're seeing is straightforward—your PHP 7.1 installation doesn't have the mbstring extension installed, which is a required dependency for Laravel 5.6. Since you're using Debian/Ubuntu's apt package manager, here's the step-by-step fix:

• Install the mbstring extension for PHP 7.1
  First, update your package list and install the extension with this command:

  sudo apt-get update && sudo apt-get install php7.1-mbstring
  

  The update ensures you're pulling the latest package information before installing.

• Verify the extension is enabled
  After installation, confirm that mbstring is loaded in your CLI PHP environment by running:

  php -m | grep mbstring
  

  If you see mbstring printed in the output, the extension is ready to use.

• Re-run Composer Update
  Head back to your project directory and execute the update command again:

  composer update
  

  This time, Composer should resolve the dependencies without the missing extension error.

Optional: Restart your web server (if needed) #

If you plan to run this Laravel project on a web server like Apache, you'll want to restart the server to ensure the extension is loaded for web requests too:

# For systemd-based systems (Ubuntu 16.04+)
sudo systemctl restart apache2

# For older systems using init.d
sudo service apache2 restart

内容的提问来源于stack exchange，提问作者Ray Coder