composer簡介
composer是一款PHP依賴管理工具，類似于node.js的npm，java的maven，gradle等等。如果在一個PHP項目中一些庫依賴于其他庫，就聲明所依賴的庫，Composer 就會找出相應版本的包并安裝，預設情況下下載下傳到項目的某個目錄中（例如 vendor）進行安裝。使用 Composer 可以很輕松的使用一個指令将其他人的優秀代碼引用到我們的項目中來。
windows系統怎麼安裝composer
打開 https://getcomposer.org/download/ ，下載下傳composer-setup，點選“下一步”，過程中會要選擇PHP路徑，選到php.exe即可。
直接敲入 composer，檢查是否安裝成功
熟悉了上面的英文，也就熟悉了composer應用場景中90%，一起來看看
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Composer version 2.5.5 2023-03-21 11:50:05
Usage:
// 指令 選項 參數
command [options] [arguments]
// 選項
Options:
---help 幫助資訊
-h, --help Display help for the given command. When no command is given display help for the list command
---quiet 安靜模式 不輸出任何資訊
-q, --quiet Do not output any message
---version 顯示目前版本
-V, --version Display this application version
---ansi 強制 ansi輸出
--ansi|--no-ansi Force (or disable --no-ansi) ANSI output
---no interation 不要問任何互動問題
-n, --no-interaction Do not ask any interactive question
---profile 展示計時和記憶體使用資訊
--profile Display timing and memory usage informatio
---no plugins 禁用插件
--no-plugins Whether to disable plugins.
---跳過composer.json裡所有腳本執行
--no-scripts Skips the execution of all scripts defined in composer.json file.
---working-dir 使用指定的工作目錄
-d, --working-dir=WORKING-DIR If specified, use the given directory as working directory.
---no cache 禁用緩存
--no-cache Prevent use of the cache
---verbose 增加資訊曝光 vvv表示debug
-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 顯示composer簡短介紹
about Shows a short information about Composer
--archive 建立composer包的歸檔
archive Creates an archive of this composer package
--audit 檢查已安裝包的安全建議
audit Checks for security vulnerability advisories for installed packages
--browse 在浏覽器打開包的倉庫位址或者首頁
browse [home] Opens the package's repository URL or homepage in your browser
--bump 提升composer.json最低要求版本為已安裝版本
bump Increases the lower limit of your composer.json requirements to the currently installed versions
--check-platform-reqs 檢查平台要求是否已滿足
check-platform-reqs Check that platform requirements are satisfied
--clear cache 清理緩存
clear-cache [clearcache|cc] Clears composer's internal package cache
--completion 轉儲腳本
completion Dump the shell completion script
--config 設定配置選項
config Sets config options
--create-project 建立項目
create-project Creates new project from a package into given directory
--depends 展示哪項依賴決定的目前包安裝
depends [why] Shows which packages cause the given package to be installed
--diagnose 診斷系統，識别常見錯誤
diagnose Diagnoses the system to identify common errors
--dump autoload 轉儲自動加載
dump-autoload [dumpautoload] Dumps the autoloader
--exec 執行供應的二進制編碼
exec Executes a vendored binary/script
--fund 如何自助依賴？
fund Discover how to help fund the maintenance of your dependencies
--global 允許全局運作指令
global Allows running commands in the global composer dir ($COMPOSER_HOME)
--help 展示指令的幫助
help Display help for a command
--init 目前目錄建立composer.json檔案
init Creates a basic composer.json file in current directory
--install 從composer.lock安裝項目，沒有composer.lock就以composer.json為準
install [i] Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json
--licenses 展示依賴的licenses資訊
licenses Shows information about licenses of dependencies
--list列舉指令
list List commands
--outdated 展示可以更新的依賴包，以及最新的版本号
outdated Shows a list of installed packages that have updates available, including their latest version
--prohibits 沖突展示，展示哪些已安裝的依賴包阻止特定依賴包
prohibits [why-not] Shows which packages prevent the given package from being installed
--reinstall 解除安裝、重裝指定的依賴包
reinstall Uninstalls and reinstalls the given package names
--remove 從require或者require-dev移除包
remove Removes a package from the require or require-dev
--require 添加依賴包到composer.json配置檔案，并且安裝依賴包
require [r] Adds required packages to your composer.json and installs them
--run script 運作composer.json裡的腳本
run-script [run] Runs the scripts defined in composer.json
--search 查找依賴包
search Searches for packages
--selfupdate 更新composer.phar到最新版本
self-update [selfupdate] Updates composer.phar to the latest version
--show 展示依賴包的資訊
show [info] Shows information about packages
--status 展示本地修改的依賴包的清單
status Shows a list of locally modified packages
--suggests 展示依賴包的建議
suggests Shows package suggestions
--update 參照composer.json配置更新依賴包到最新版，并且更新composer.json檔案
update [u|upgrade] Updates your dependencies to the latest version according to composer.json, and updates the composer.lock file
--validate 驗證composer.json和composer.lock檔案
validate Validates a composer.json and composer.lock