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
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