$request->domain() 获取URL信息

$request = Request::instance();
// 获取当前域名
echo ‘domain: ‘ . $request->domain() . ‘
‘;
// 获取当前入口文件
echo ‘file: ‘ . $request->baseFile() . ‘
‘;
// 获取当前URL地址 不含域名
echo ‘url: ‘ . $request->url() . ‘
‘;
// 获取包含域名的完整URL地址
echo ‘url with domain: ‘ . $request->url(true) . ‘
‘;
// 获取当前URL地址 不含QUERY_STRING
echo ‘url without query: ‘ . $request->baseUrl() . ‘
‘;
// 获取URL访问的ROOT地址
echo ‘root:’ . $request->root() . ‘
‘;
// 获取URL访问的ROOT地址
echo ‘root with domain: ‘ . $request->root(true) . ‘
‘;
// 获取URL地址中的PATH_INFO信息
echo ‘pathinfo: ‘ . $request->pathinfo() . ‘
‘;
// 获取URL地址中的PATH_INFO信息 不含后缀
echo ‘pathinfo: ‘ . $request->path() . ‘
‘;
// 获取URL地址中的后缀信息
echo ‘ext: ‘ . $request->ext() . ‘
‘;

输出结果：
domain: http://tp5.com
file: /index.php
url: /index/index/hello.html?name=thinkphp
url with domain: http://tp5.com/index/index/hello.html?name=thinkphp
url without query: /index/index/hello.html
root: root with domain: http://tp5.com
pathinfo: index/index/hello.html
pathinfo: index/index/hello
ext: html

参考：
https://blog.csdn.net/ts3211/article/details/86536489