介绍 (Introduction)

In this quickstart guide, we’ll install Composer on an Ubuntu 20.04 server.

在此快速入门指南中，我们将在Ubuntu 20.04服务器上安装Composer 。

For a more detailed version of this tutorial, with more explanations of each step, please refer to How To Install and Use Composer on Ubuntu 20.04.

有关本教程的更详细版本，以及每个步骤的更多说明，请参考如何在Ubuntu 20.04上安装和使用Composer 。

先决条件 (Prerequisites)

To follow this guide, you’ll need access to an Ubuntu 20.04 server as a sudo user.

要遵循本指南，您需要以sudo用户身份访问Ubuntu 20.04服务器。

第1步-安装依赖项 (Step 1 — Install Dependencies)

Start by updating your package manager cache and installing the required dependencies, including php-cli:

首先更新包管理器缓存并安装所需的依赖项，包括php-cli ：

第2步-下载并安装Composer (Step 2 — Download and Install Composer)

Make sure you’re in your home directory, then retrieve the Composer installer using curl:

确保您位于主目录中，然后使用curl检索Composer安装程序 ：

Next, we’ll verify that the downloaded installer matches the SHA-384 hash for the latest installer found on the Composer Public Keys / Signatures page.

接下来，我们将验证下载的安装程序是否与Composer公钥/签名页面上找到的最新安装程序的SHA-384哈希匹配。

Using curl, fetch the latest signature and store it in a shell variable:

使用curl ，获取最新的签名并将其存储在shell变量中：

Now execute the following PHP code to verify that the installation script is safe to run:

现在执行以下PHP代码，以验证安装脚本可以安全运行：

You’ll see the following output:

您将看到以下输出：

Installer verified

Note: If the output says Installer corrupt, you’ll need to repeat the download and verification process until you have a verified installer.

注意 ：如果输出显示Installer corrupt ，则需要重复下载和验证过程，直到获得经过验证的安装程序为止。

The following command will download and install Composer as a system-wide command named composer, under /usr/local/bin:

以下命令将在/usr/local/bin下以名为composer的系统级命令下载并安装Composer：

You’ll see output similar to this:

您将看到类似于以下的输出：

   
   

    
    Output
   
   
All settings correct for using Composer
Downloading...

Composer (version 1.10.5) successfully installed to: /usr/local/bin/composer
Use it: php /usr/local/bin/composer

To test your installation, run:

要测试您的安装，请运行：

   
   

    
    Output
   
   
   ______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                    /_/
Composer version 1.10.5 2020-04-10 11:44:22

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
...

This verifies that Composer was successfully installed on your system and is available system-wide.

这将验证Composer已成功安装在您的系统上并且在系统范围内可用。

翻译自: https://www.digitalocean.com/community/tutorials/how-to-install-composer-on-ubuntu-20-04-quickstart