Get Base URL / Path with PHP

index.php

<?php

/*
It works these urls:

Without sub dir

http://site.com/index.php
http://site.com/index.php/

With sub dir

http://site.com/sub/index.php
http://site.com/sub/index.php/
http://site.com/sub/other_sub/index.php
http://site.com/sub/other_sub/index.php/
*/

require_once 'url.php';

class Home
{
	use URL;
}

$h = new Home();

?>

<a href="<?=$h->get['base_url']?>">Base</a>

url.php

<?php

trait URL {
	private $url = '';
  	private $current_url = '';
	public $get = '';

	function __construct()
	{
		$this->url = $_SERVER['SERVER_NAME'];
		$this->current_url = $_SERVER['REQUEST_URI'];

		$clean_server = str_replace('', $this->url, $this->current_url);
		$clean_server = explode('/', $clean_server);

		$this->get = array('base_url' => "/".$clean_server[1]);
	}
}