Linux下全局安装composer方法

//下载composer 

curl -sS https://getcomposer.org/installer | php 

//将composer.phar文件移动到bin目录以便全局使用composer命令

mv composer.phar /usr/local/bin/composer //切换国内源

composer config -g repo.packagist composer https://packagist.phpcomposer.com

本人亲测有效！！！