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tp5利用composer安装扩展很方便，具体怎么安装composer，可以自己百度。

首先在tp根目录的composer.json文件的‘require’中加入你需要安装的扩展，

    "require": {
        "php": ">=5.6.0",
        "topthink/framework": "5.1.*",
        "topthink/think-helper": "^1.0",
        "topthink/think-captcha": "^2.0",
        "topthink/think-image": "^1.0",
        "topthink/think-installer": "^1.0",
        "topthink/think-sae": "^1.1",
        "phpmailer/phpmailer": "^5.2",
        "yfcmf/geetest": "^1.0",
        "qiniu/php-sdk": "^7.1",
        "overtrue/wechat": "~3.1",
        "phpoffice/phpexcel": "^1.8",
	"riverslei/payment": "~2.0",
	"yfcmf/tp5-addons": "^1.0",
        "aliyuncs/oss-sdk-php": "^2.2.3",
        "flc/alidayu": "^2.0"
    },

比如”phpoffice/phpexcel”: “^1.8″,

然后在命令行工具切换到tp根目录输入composer update phpoffice/phpexcel 运行即可。

phpoffice类库就已经安装到vendor文件夹下，同时也会将其他没有安装的一起安装

那如果需要移除依赖项该怎么办？这里使用remove 移除命令，例如:

composer remove phpoffice/phpexcel