Normalization of Shifted Paths When Parsing in PHP

Let's now learn how to normalize relative shifted paths. Such paths contain one or more ../ constructs, meaning that we need to go up one folder level.

Let's look at an example. Suppose we have the following path:

<?php
	$href = '../dir/page.html';
?>

Let the parser be accessing the following URL:

<?php
	$url = 'http://targ.loc/cat/sat/';
?>

In this case, the normalized path will look as follows:

<?php
	$norm = 'http://targ.loc/cat/dir/page.html';
?>

Implement a function that will perform normalization of paths of this type.

Let the parser be accessing the following URL:

<?php
	$url = 'http://targ.loc/cat/sat/';
?>

Get all href on the page and perform their normalization:

<a href="page.html">text</a>
<a href="dir/page.html">text</a>
<a href="../dir/page.html">text</a>
<a href="../../dir/page.html">text</a>