首先
cp /usr/local/php/bin/php /usr/sbin/
# 下载composer.phar
curl -sS http://install.phpcomposer.com/installer | php
# 把composer.phar移动到环境下让其变成可执行
mv composer.phar /usr/local/bin/composer
# 测试
composer -V
# 输出：Composer version 1.0-dev (e64470c987fdd6bff03b85eed823eb4b865a4152) 2015-05-28 14:52:12安装Composer
原文：http://www.cnblogs.com/hangxing1996/p/6713247.html
