Difference between src and require or include (path)

Question

From any file on the website, if I want to call the image posted to / ico, I:

$arrow = "/ico/arrow.png";

without any ../ ico / ect. or. / ico / etc.

Now if I want to include the header.php file saved in / test:

<?php
include "/test/header.php";

or

require "/test/header.php";

or

require_once "/test/header.php";
?>

It won't work. I have to specify the path with ../ or. /.

I don't understand the difference!

Thank!

+3

Perocat 11 Feb 13 at 18:41

1 answer

Colin M · Answer 1 · 2013-02-11T18:45:10+0000

Image sources and hrefs links are evaluated by the client (browser). This means that they refer to:

Network root (if the URL starts with /

). For the purposes of this answer, it is easier to describe it as: your domain. If you are at http://www.yourpage.com/folder1/folder2/file.php and link to /img/arrow.png

then it is assumed that you mean http://yourpage.com/img/arrow.png
The current directory (if the URL doesn't start with /

or starts with ./

). If you are on http://www.yourpage.com/folder1/folder2/file.php and link to img/arrow.png

then it is assumed that you mean http://yourpage.com/folder1/folder2/img/arrow.png

Includes, on the other hand, evaluation by the server. This means that they refer to:

Filesystem root (if path starts with /

)
The current working directory of the script (if the path does not start with /

or starts with ./

)