要全局安裝Composer包，需使用composer global require命令，1. 執(zhí)行composer global require vendor/package-name將包安裝到全局vendor目錄；2. 確保Composer的bin目錄（如~/.composer/vendor/bin或C:\Users\YourName\AppData\Roaming\Composer\vendor\bin）已添加到系統(tǒng)PATH中，以便運(yùn)行可執(zhí)行文件；3. 通過composer global update更新或composer global remove vendor/package-name卸載全局包，此方法適用于跨項(xiàng)目使用的CLI工具，如laravel/installer或php-cs-fixer，且只需配置一次PATH即可永久生效。

To install a package globally with Composer, you use the global keyword. This installs the package into a central Composer directory on your system, making its executables available globally (assuming the Composer bin directory is in your system's PATH).

Here’s how to do it:

1. Use the composer global require command

Run this command in your terminal:

composer global require vendor/package-name

For example, to install Laravel's installer globally:

composer global require laravel/installer

This installs the package into Composer’s global vendor directory (usually located at ~/.composer/vendor on Linux/macOS or C:\Users\YourName\AppData\Roaming\Composer\vendor on Windows).

2. Make sure the Composer bin directory is in your PATH

After installing a global package, you can run its binaries (like laravel, phpcs, etc.) only if the Composer bin directory is in your system’s PATH.

The global Composer bin directory is typically:

• Linux/macOS: ~/.composer/vendor/bin
• Windows: C:\Users\YourName\AppData\Roaming\Composer\vendor\bin

Add it to your shell profile (like .bashrc, .zshrc, or system environment variables on Windows):

export PATH="$HOME/.composer/vendor/bin:$PATH"

Then reload your shell:

source ~/.zshrc  # or ~/.bashrc

? Tip: You only need to do this once. After the bin directory is in your PATH, all future global packages will be executable automatically.

3. Updating or removing global packages

• Update a global package:

  composer global update

• Remove a package:

  composer global remove vendor/package-name

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  Common use cases

  Global packages are typically CLI tools, such as:

  • laravel/installer
  • phpunit/phpunit
  • squizlabs/php_codesniffer
  • friendsofphp/php-cs-fixer

  These tools are meant to be used across multiple projects, so installing them globally avoids duplication.

  ---

  Just remember: global doesn’t mean “available in every project” — it means “installed once, usable from anywhere via command line.” For project-specific dependencies, always use composer require without global.

  Basically: use global for tools, not for app dependencies.

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