Ubuntu18.04 安装Composer

Composer:
https://getcomposer.org/download/

linux服务器上执行下操作即可

sun@karat:~$ php -r "copy('https://getcomposer.org/installer', 'composer-setup.p                                                                                             hp');"
sun@karat:~$ php -r "if (hash_file('sha384', 'composer-setup.php') === '48e3236262b34d30969dca3c37281b3b4bbe3221bda826ac6                                                    a9a62d6444cdb0dcd0615698a5cbe587c3f0fe57a54d8f5') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink(                                                    'composer-setup.php'); } echo PHP_EOL;"
Installer verified
sun@karat:~$ php composer-setup.php
All settings correct for using Composer
Downloading...

Composer (version 1.8.6) successfully installed to: /home/sun/composer.phar
Use it: php composer.phar

sun@karat:~$ php -r "unlink('composer-setup.php');"
sun@karat:~$ composer

Command 'composer' not found, but can be installed with:

sudo apt install composer

sun@karat:~$ php composer.phar
   ______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                    /_/
Composer version 1.8.6 2019-06-11 15:03:05

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.
  -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 com                                                    poser.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 com                                                    poser.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-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 compo                                                    ser.lock file.
  update               Upgrades your dependencies to the latest version according to composer.json, and updates the compo                                                    ser.lock file.
  upgrade              Upgrades your dependencies to the latest version according to composer.json, and updates the compo                                                    ser.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.

使用的时候,只是针对某个用户的。哪个用户安装的只能哪个用户使用,其它用户会出现:

为了解决多个用户(全局使用)。我们需要卸载了,重新安装,或者执行下面的命令:

cp composer.phar /usr/local/bin/composer

参考文档:
https://segmentfault.com/a/1190000006835510

https://getcomposer.org/download/

https://cloud.tencent.com/developer/article/1350310

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