如何在Windows电脑安装Laravel 8项目？已安装Composer仍无法安装的问题求助

Hey there! Let’s start with the standard installation process first—nice and straightforward once you’ve got the prerequisites sorted.

• Check your environment first
  Laravel 8 requires PHP 7.3 to 8.1 (stick within this range for full compatibility) and several enabled extensions. Open Command Prompt or PowerShell and run these commands to verify:

  • php -v (confirm your PHP version meets the requirement)
  • composer -V (make sure Composer is correctly installed and accessible)
  • If you need to enable extensions, find your php.ini file with php --ini, then uncomment (remove the leading ; from) these lines:
    extension=openssl, extension=pdo_mysql, extension=mbstring, extension=tokenizer, extension=xml, extension=ctype, extension=json

• Create your Laravel 8 project
  You’ve got two easy options here:

  1. Directly via Composer: Run this command to create a project with Laravel 8 specifically:
     composer create-project laravel/laravel:^8.0 your-project-name
     Replace your-project-name with whatever you want to call your app.
  2. Using the Laravel Installer: First install the installer compatible with Laravel 8:
     composer global require laravel/installer:^4.0
     Then create your project with:
     laravel new your-project-name --version=8.x

• Test your installation
  Navigate into your project folder: cd your-project-name
  Run the development server: php artisan serve
  Open your browser and go to http://localhost:8000—you should see the Laravel welcome page if everything worked!

If Composer’s already set up but you’re still stuck, let’s troubleshoot the most common issues:

• PHP version mismatch
  Double-check php -v—if your version is below 7.3 or above 8.1, Laravel 8 won’t install properly. Grab the correct PHP version from the official PHP site, update your system’s PATH environment variable to point to it, and restart your terminal.

• Missing or disabled PHP extensions
  As mentioned earlier, missing extensions are a top culprit. Recheck your php.ini file to ensure all required extensions are enabled, then restart your terminal before trying again.

• Composer cache corruption
  Old cache files can mess up dependency downloads. Clear the cache with:
  composer clear-cache
  Then re-run your project creation command.

• Network issues blocking dependency downloads
  If you’re in a region with slow access to global Composer repositories, switch to a domestic mirror to speed things up:
  composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
  Try installing again after this.

• Permission problems
  On Windows, sometimes regular user accounts don’t have write access to the directory where you’re creating the project. Right-click Command Prompt/PowerShell and select "Run as administrator", then try the installation command again.

• Outdated Composer version
  Old Composer versions might not support Laravel 8’s dependency structure. Update Composer to the latest version with:
  composer self-update

内容的提问来源于stack exchange，提问作者Sajedur Rahman