參考鏈接:https://blog.csdn.net/sinat_14826983/article/details/84654805
https://www.cnblogs.com/qq1069284034/p/8746279.html
1、檢查php的環境變量: echo $PATH
2、增加php的環境變量:export PATH=$PATH:/home/work/app/php/bin
3、下載composer.phar: curl -sS https://getcomposer.org/installer | php
4、sudo mv composer.phar /usr/bin/composer(root權限)
5、composer --version