尝试安装 Laravel 8 时，我收到以下警告消息：
我已经安装XAMPP for Linux 8.0.3 并具有 PHP 版本 8.0.3安装在 XAMPP 包内。
我怀疑 Laravel 8.* 还不支持 php 8.*，但我不确定。谢谢。
$composer create-project laravel/laravel blog --prefer-dist "8.*"
Deprecation Notice: Required parameter $path follows optional parameter $schema in phar:///usr/local/bin/composer/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:62
Deprecation Notice: Required parameter $path follows optional parameter $schema in phar:///usr/local/bin/composer/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:108
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Warning from https://repo.packagist.org: You are using an outdated version of Composer. Composer 2 is now available and you should upgrade. See https://getcomposer.org/2
Installing laravel/laravel (v8.5.16)
- Installing laravel/laravel (v8.5.16): Downloading (100%)
Created project in blog
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
Deprecation Notice: Method ReflectionParameter::getClass() is deprecated in phar:///usr/local/bin/composer/src/Composer/Repository/RepositoryManager.php:130
以及以下错误消息：
[UnexpectedValueException]
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答案1
所讨论的问题似乎来自权限冲突。
这组权限没有按预期工作：
sudo chmod -R 755 /opt/lampp/htdocs
sudo chown -R username:username /opt/lampp/htdocs
我不得不这样设置权限：
sudo chmod -R 777 /opt/lampp/htdocs
sudo chown -R username:username /opt/lampp/htdocs
并且成功了。虽然我知道不建议授予 777 个权限，但这是使我的安装成功的唯一方法。我真的不知道为什么，但现在它可以工作了。