在本教程中，我们将向您展示如何在 AlmaLinux 8 上安装 Composer。对于那些不知道的人，Composer 是一种流行的 PHP 依赖项管理器。 它充当某种项目经理，帮助程序员管理将在项目到项目基础上使用的依赖项。
本文假设您至少具有 Linux 的基本知识，知道如何使用 shell，并且最重要的是，您在自己的 VPS 上托管您的站点。 安装非常简单，假设您在 root 帐户中运行，否则您可能需要添加 ‘sudo‘ 到获得 root 权限的命令。 我将向您展示如何在 AlmaLinux 8 上逐步安装 Composer。您可以按照 Rocky Linux 的相同说明进行操作。
在 AlmaLinux 8 上安装 Composer
步骤 1. 首先，让我们先确保您的系统是最新的。
sudo dnf update sudo dnf install epel-release
步骤 2. 安装 PHP。
运行以下命令以安装 PHP CLI（命令行界面）包和所有其他依赖项：
sudo dnf install @php
步骤 3. 在 AlmaLinux 8 上安装 Composer。
安装 PHP CLI 后，下载 Composer 安装程序脚本：
wget https://getcomposer.org/installer -O composer-installer.php
下载安装程序后，我们可以使用以下命令在我们的 AlmaLinux 系统上安装 Composer：
php composer-installer.php --filename=composer --install-dir=/usr/local/bin
安装完成后验证 PHP Composer 版本：
composer --version
输出：
[[email protected] ~]# composer --version Composer version 2.0.11 2021-05-07 14:11:22
要检查使用页面，请使用：
$ composer ______ / ____/___ ____ ___ ____ ____ ________ _____ / / / __ / __ `__ / __ / __ / ___/ _ / ___/ / /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ / ____/____/_/ /_/ /_/ .___/____/____/___/_/ /_/ Composer version 2.0.11 2021-05-07 14:12:04 Usage: command [options] [arguments] Options: -h, --help Display this help message -q, --quiet Do not output any message -V, --version Display this application version --ansi Force ANSI output --no-ansi Disable ANSI output -n, --no-interaction Do not ask any interactive question --profile Display timing and memory usage information --no-plugins Whether to disable plugins. -d, --working-dir=WORKING-DIR If specified, use the given directory as working directory. --no-cache Prevent use of the cache -v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug Available commands: about Shows the short information about Composer. archive Creates an archive of this composer package. browse Opens the package's repository URL or homepage in your browser. check-platform-reqs Check that platform requirements are satisfied. clear-cache Clears composer's internal package cache. clearcache Clears composer's internal package cache. config Sets config options. create-project Creates new project from a package into given directory. depends Shows which packages cause the given package to be installed. diagnose Diagnoses the system to identify common errors. dump-autoload Dumps the autoloader. dumpautoload Dumps the autoloader. exec Executes a vendored binary/script. global Allows running commands in the global composer dir ($COMPOSER_HOME). help Displays help for a command home Opens the package's repository URL or homepage in your browser. i Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json. info Shows information about packages. init Creates a basic composer.json file in current directory. install Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json. licenses Shows information about licenses of dependencies. list Lists commands outdated Shows a list of installed packages that have updates available, including their latest version. prohibits Shows which packages prevent the given package from being installed. remove Removes a package from the require or require-dev. require Adds required packages to your composer.json and installs them. run Runs the scripts defined in composer.json. run-script Runs the scripts defined in composer.json. search Searches for packages. self-update Updates composer.phar to the latest version. selfupdate Updates composer.phar to the latest version. show Shows information about packages. status Shows a list of locally modified packages, for packages installed from source. suggests Shows package suggestions. u Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file. update Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file. upgrade Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file. validate Validates a composer.json and composer.lock. why Shows which packages cause the given package to be installed. why-not Shows which packages prevent the given package from being installed.
恭喜！ 您已成功安装 Composer。 感谢您使用本教程在您的 AlmaLinux 8 系统上安装 Composer。 如需更多帮助或有用信息，我们建议您查看 Composer 官方网站.
