Composer是流行的PHP依赖性管理器。它起某种项目管理器的作用，可以帮助程序员管理将在项目间使用的依赖项。
在AlmaLinux 8上安装Composer
步骤1.首先，让我们首先确保您的系统是最新的。
sudo dnf update sudo dnf install epel-release
第2步。安装PHP。
运行以下命令以安装PHP CLI（命令行界面）程序包和所有其他依赖项：
sudo dnf install @php
步骤3.在AlmaLinux上安装Composer 8。
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：
[root@idroot.us ~]# composer --version Composer version 2.0.11 2021-05-07 14:11:22
要查看使用情况页面，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.
恭喜你！您已经成功安装了Composer。感谢您使用本教程在AlmaLinux 8系统上安装Composer。如需其他帮助或有用信息，建议您查看Composer官方网站。
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