wget https://getcomposer.org/composer.phar
mv composer.phar composer
chmod +x composer
提前安装了php，现在连接已安装php
ln -s /usr/local/php-7.4/bin/php /usr/local/bin/php
现在可以通过./composer 命令运行composer，但这只仅限于在当前目录运行。
`./composer
#运行后显示代码
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Continue as root/super user [yes]? yes
/ _/ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ /
/ // // / / / / / / // / // (__ ) / /
_/_// // // ./_//_//
//
Composer version 2.5-dev+1b3a2ed6f62908952da14d96d163cdfe481f6b8d (2.5-dev) 2022-10-25 14:38:01
Usage:
command [options] [arguments]
Options:
-h, --help Display help for the given command. When no command is given display help for the list command
-q, --quiet Do not output any message
-V, --version Display this application version
--ansi|--no-ansi Force (or disable --no-ansi) ANSI output
-n, --no-interaction Do not ask any interactive question
--profile Display timing and memory usage information
--no-plugins Whether to disable plugins.
--no-scripts Skips the execution of all scripts defined in composer.json file.
-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 a short information about Composer
archive Creates an archive of this composer package
audit Checks for security vulnerability advisories for installed packages
browse [home] Opens the package's repository URL or homepage in your browser
bump Increases the lower limit of your composer.json requirements to the currently installed versions
check-platform-reqs Check that platform requirements are satisfied
clear-cache [clearcache|cc] Clears composer's internal package cache
completion Dump the shell completion script
config Sets config options
create-project Creates new project from a package into given directory
depends [why] Shows which packages cause the given package to be installed
diagnose Diagnoses the system to identify common errors
dump-autoload [dumpautoload] Dumps the autoloader
exec Executes a vendored binary/script
fund Discover how to help fund the maintenance of your dependencies
global Allows running commands in the global composer dir ($COMPOSER_HOME)
help Display help for a command
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 List commands
outdated Shows a list of installed packages that have updates available, including their latest version
prohibits [why-not] Shows which packages prevent the given package from being installed
reinstall Uninstalls and reinstalls the given package names
remove Removes a package from the require or require-dev
require [r] Adds required packages to your composer.json and installs them
run-script [run] Runs the scripts defined in composer.json
search Searches for packages
self-update [selfupdate] Updates composer.phar to the latest version
show [info] Shows information about packages
status Shows a list of locally modified packages
suggests Shows package suggestions
update [u|upgrade] Updates your dependencies to the latest version according to composer.json, and updates the composer.lock file
validate Validates a composer.json and composer.lock
#运行成功`
要想全局使用，composer ，要设置把它为全局变量。找到composer文件，把它移到/usl/local/bin 目录，这样就可以在全局使用composer 命令。
mv composer /usl/local/bin
至此composer安装完成可以全局运行
