相关疑难解决方法(0)

我正在尝试在从 git 克隆的 Laravel 项目中进行作曲家安装。

但我收到一些错误。

我解决的第一个问题是：

- phpunit/phpunit[8.5.0, ..., 8.5.x-dev] require ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.

通过做：

sudo apt install php7-4-xml php7.4-mbstring

但现在当我执行 a composer update或composer installI\xe2\x80\x99m 时得到这个答案：

PHP Fatal error: Uncaught Error: Class 'Normalizer' not found in /usr/share/php/Symfony/Component/Console/Helper/Helper.php:129。

Stack trace:

#0 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(516): Symfony\\Component\\Console\\Helper\\Helper::strlenWithoutDecoration()\n#1 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(576): Symfony\\Component\\Console\\Helper\\ProgressBar::Symfony\\Component\\Console\\Helper\\{closure}()\n#2 [internal function]: Symfony\\Component\\Console\\Helper\\ProgressBar->Symfony\\Component\\Console\\Helper\\{closure}()\n#3 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(589): preg_replace_callback()\n#4 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(414): Symfony\\Component\\Console\\Helper\\ProgressBar->buildLine()\n#5 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(323): Symfony\\Component\\Console\\Helper\\ProgressBar->display()\n#6 /usr/share/php/Composer/Util/Loop.php(85): …