一、在站点根目录创建composer.json文件 { "description": "The CodeIgniter framework", "name": "codeigniter/framework", "type": "project", "homepage": "https://codeigniter.com", "license": "MIT", "support": { "forum": "http://forum.codeigniter.com/", "wiki": "https://github.com/bcit-ci/CodeIgniter/wiki", "irc": "irc://irc.freenode.net/codeigniter", "source": "https://github.com/bcit-ci/CodeIgniter" }, "require": { "php": ">=5.2.4", "monolog/monolog": "~1.0", "aws/aws-sdk-php": "*", "phpoffice/phpexcel": "*", "phpmailer/phpmailer": "*", "mpdf/mpdf": "*" }, "suggest": { "paragonie/random_compat": "Provides better randomness in PHP 5.x" }, "require-dev": { "mikey179/vfsStream": "1.1.*" } } 二、操作composer.json,首先需要先安装composer的! 1、cmd-》站点目录-》composer install 第一次安装第三方类库 2、后期新增第三方类库,首先到https://packagist.org/packages/查看相应版本的类库,然后 cmd-》站点目录-》composer require phpoffice/phpexcel * 回车就可以安装了 三、更新第三方类库 cmd-》站点目录-》composer update 安装好类库后,就可以直接使用第三方类库里面的类了,有命名空间的,需要把类库中的命名空间加到文件的头部,然后直接实例化类库$objPHPExcel = new PHPExcel();