一，查看升级前的版本:
liuhongdi@lhdpc:/data/php/tpapibase$ composer --version
Composer version 2.5.1 2022-12-22 15:33:54二，升级，注意先sudo到root
liuhongdi@lhdpc:/data/php/tpapibase$ sudo -i
[sudo] liuhongdi 的密码：
root@lhdpc:~# composer self-update
Upgrading to version 2.5.8 (stable channel).
Use composer self-update --rollback to return to version 2.5.1三，查看升级后的版本:
liuhongdi@lhdpc:/data/php/tpapibase$ composer --version
Composer version 2.5.8 2023-06-09 17:13:21四，查看composer的可用命令
liuhongdi@lhdpc:/data/php/tpapibase$ composer list
______
/ ____/___ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
/_/
Composer version 2.5.8 2023-06-09 17:13:21
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 ($COMPOSER_HOME)
help Display help for a command
init Creates a basic composer.json file in current directory
install [i] Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json
licenses Shows information about licenses of dependencies
list List commands
outdated Shows a list of installed packages that have updates available, including their latest version
prohibits [why-not] Shows which packages prevent the given package from being installed
reinstall Uninstalls and reinstalls the given package names
remove Removes a package from the require or require-dev
require [r] Adds required packages to your composer.json and installs them
run-script [run] Runs the scripts defined in composer.json
search Searches for packages
self-update [selfupdate] Updates composer.phar to the latest version
show [info] Shows information about packages
status Shows a list of locally modified packages
suggests Shows package suggestions
update [u|upgrade] Updates your dependencies to the latest version according to composer.json, and updates the composer.lock file
validate Validates a composer.json and composer.lock说明：刘宏缔的架构森林—专注it技术的博客，
网站：https://blog.imgtouch.com
原文: https://blog.imgtouch.com/index.php/2023/07/20/composer-sheng-ji-zi-shen-ban-ben-selfupdate-2-5-x/
代码: https://github.com/liuhongdi/ 或 https://gitee.com/liuhongdi
说明：作者:刘宏缔 邮箱: 371125307@qq.com
五，查看self-update的帮助信息
liuhongdi@lhdpc:/data/php/tpapibase$ composer help self-update
Description:
Updates composer.phar to the latest version
Usage:
self-update [options] [--] [<version>]
selfupdate
Arguments:
version The version to update to
Options:
-r, --rollback Revert to an older installation of composer
--clean-backups Delete old backups during an update. This makes the current version of composer the only backup available after the update
--no-progress Do not output download progress.
--update-keys Prompt user for a key update
--stable Force an update to the stable channel
--preview Force an update to the preview channel
--snapshot Force an update to the snapshot channel
--1 Force an update to the stable channel, but only use 1.x versions
--2 Force an update to the stable channel, but only use 2.x versions
--2.2 Force an update to the stable channel, but only use 2.2.x LTS versions
--set-channel-only Only store the channel as the default one and then exit
-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
Help:
The self-update command checks getcomposer.org for newer
versions of composer and if found, installs the latest.
php composer.phar self-update
Read more at https://getcomposer.org/doc/03-cli.md#self-update-selfupdate