为什么即使php版本正确，我也不能在ssh上运行composer install？

Question

服务器正在使用默认的php版本5.6，我需要7.1，所以我最近安装了7.1版本。当我运行命令php -v时显示php 5.6，因此我使用echo 'alias php="/opt/cpanel/ea-php71/root/usr/bin/php"' >> ~/.bashrc更改了别名，它成功了，因为现在显示的是php 7.1.32（cli）。但是我仍然不能使用ssh在CentOS服务器中运行composer install，并且显示错误

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - This package requires php ^7.1.3 but your PHP version (5.6.40) does not satisfy that requirement.
  Problem 2
    - beyondcode/laravel-dump-server 1.3.0 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.2.2 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.2.1 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.2.0 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.1.3 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.1.2 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.1.1 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.1.0 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.0.0 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - beyondcode/laravel-dump-server 1.3.0 requires php ^7.1 -> your PHP version (5.6.40) does not satisfy that requirement.
    - Installation request for beyondcode/laravel-dump-server ^1.0 -> satisfiable by beyondcode/laravel-dump-server[1.0.0, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.2.0, 1.2.1, 1.2.2, 1.3.0].