php -r "readfile('http://install.phpcomposer.com/installer');" | php
-bash: php: command not found
[root@VM_11_128_centos src]# which php
/usr/bin/which: no php in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
先找到php安装的路径
[root@VM_11_128_centos src]# cd /usr/local/php
[root@VM_11_128_centos php]# ls
bin etc include lib php sbin var
[root@VM_11_128_centos php]# cd bin/
[root@VM_11_128_centos bin]# ls
phar phar.phar php php-cgi php-config phpdbg phpize
[root@VM_11_128_centos bin]# pwd
/usr/local/php/bin
建立软连接 到 /usr/sbin/ 目录下
[root@VM_11_128_centos bin]# ln -s /usr/local/php/bin/php /usr/sbin/php
[root@VM_11_128_centos bin]# php -v
PHP 7.0.10 (cli) (built: Oct 31 2016 16:19:52) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.10, Copyright (c) 1999-2016, by Zend Technologies