我为composer设置了环境variables，但是它仍然安装到默认的dir（〜/ .composer）。 任何人都可以告诉我，如果我做错了什么？
distPoint /var/www/html/laravel # COMPOSER_HOME="/opt/composer/" distPoint /var/www/html/laravel # echo $COMPOSER_HOME /opt/composer/ distPoint /var/www/html/laravel # composer global require "laravel/installer=~1.1" Changed current directory to /root/.composer ./composer.json has been created Loading composer repositories with package information Updating dependencies (including require-dev) - Installing symfony/process (v2.6.6) Downloading: 100% - Installing symfony/console (v2.6.6) Downloading: 100% - Installing guzzlehttp/streams (2.1.0) Downloading: 100% - Installing guzzlehttp/guzzle (4.2.3) Downloading: 100% - Installing laravel/installer (v1.2.0) Downloading: 100% symfony/console suggests installing symfony/event-dispatcher () symfony/console suggests installing psr/log (For using the console logger) guzzlehttp/guzzle suggests installing ext-curl (Guzzle will use specific adapters if cURL is present) Writing lock file Generating autoload files distPoint /var/www/html/laravel # ls ~/.composer/ cache composer.json composer.lock vendor distPoint /var/www/html/laravel # ls /opt/composer/ distPoint /var/www/html/laravel # 使用这个inseead：
export COMPOSER_HOME=/opt/composer
它使变量可用于子流程。