centos安装composer
1.下载composer
curl -sS https://getcomposer.org/installer | php
ps:如果出现php无法运行的情况,请先把PHP加入环境变量,具体操作参考《centOS安装PHP》
2.移动或复制composer到环境下可执行
cp composer.phar /usr/local/bin/composer
3.测试看是否安装成功
composer -V
ps:如果出现Do not run Composer as root/super user! 请切换用户运行
centos7全局安装composer
1、全局安装：
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer