我检查了所有的题目，没有任何人帮助我。

sudo curl -sS https://getcomposer.org/installer | php

现在

mv composer.phar /usr/local/bin/composer

我检查：

[root@live7263 ~]# cd /usr/local/bin/
[root@live7263 bin]# ls
composer
[root@live7263 bin]# composer list
Options:
  -h, --help                     Display help for the given command. When no command is given display help for the list command
  -q, --quiet                    Do not output any message
  -V, --version                  Display this application version
..............

现在我尝试从用户级别：

[feed@live7263 public_html]$ composer require phpoffice/phpspreadsheet
bash: composer: command not found
[feed@live7263 public_html]$ /usr/local/bin/composer.phar require phpoffice/phpspreadsheet
bash: composer: command not found
[feed@live7263 public_html]$ /usr/local/bin/composer require phpoffice/phpspreadsheet
bash: composer: command not found
[feed@live7263 public_html]$ composer install
bash: composer: command not found

配置文件. php

/* Composer Auto Loading */
$config['composer_autoload'] = 'vendor/autoload.php';

文件composer.json已在根应用程序中创建（public_html）