1. 在項目根目錄手動創建 composer.json 文件，引入包：

{
    "require": {
        "phpoffice/phpspreadsheet": "^1.3"
    }
}

2. 終端進入項目根目錄，輸入命令： composer require phpoffice/phpspreadsheet

3. 在項目根目錄會出現 vendor 文件夾

如果出現目錄沒有寫入權限，需要授權下

Cannot create cache directory /home/xiaoke/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache
Cannot create cache directory /home/xiaoke/.composer/cache/files/, or directory is not writable. Proceeding without cache
 

進入 .composer 文件夾

sudo chmod -R 777 cache/

CI 安裝 composer