获取请求URI PHP

Question

I am struck in getting the URI in my wordpress application and lack of PHP knowledge is making my progress slow. I have this URL

http://abc.com/my-blog/abc/cde 

i need to create a URL something like

http://abc.com/my-blog/added-value/abc/cde

where http://abc.com/my-blog is the URL of my wordpress blog which i can easily get using following method

home_url()

i can use PHP $_SERVER["REQUEST_URI"] to get request URI which will come up as

/my-blog/abc/cde

and than i have no direct way to add value as per my requirement

is there any way to achieve this easily in PHP or Wordpress where i can get following information

1. Home URL
2. Rest part of the URL

so that in end i can do following

Home-URL+ custom-value+Rest part of the URL

My point of Confusion

1. On my local set up $_SERVER["REQUEST_URI"] is giving me /my-blog/abc/cde, where /my-blog is installation directory of wordpress and i can easily skip first level.
2. On production server its not same as /my-blog will not be part of the URL.

Answer 1

Very briefly:

<?php

$url = "http://abc.com/my-blog/abc/cde";

$parts = parse_url($url);

$path = explode("/", $parts["path"]);
array_splice($path, 2, 0, array("added-part")); //This line does the magic!

echo $parts["scheme"] . "://" . $parts["host"] . implode("/",$path);