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How do you include a file that is more than 2 directories back. I know you can use ../index.php to include a file that is 2 directories back, but how do you do it for 3 directories back?
Does this make sense?
I tried .../index.php but it isn't working.
I have a file in /game/forum/files/index.php and it uses PHP include to include a file. Which is located in /includes/boot.inc.php; / being the root directory.
.. selects the parent directory from the current. Of course, this can be chained:
../../index.php
This would be two directories up.
To include a file one directory back, use '../file'.
For two directories back, use '../../file'.
And so on.
Although, realistically you shouldn't be performing includes relative to the current directory. What if you wanted to move that file? All of the links would break. A way to ensure that you can still link to other files, while retaining those links if you move your file, is:
require_once($_SERVER['DOCUMENT_ROOT'] . 'directory/directory/file');
DOCUMENT_ROOT is a server variable that represents the base directory that your code is located within.
. = current directory
.. = parent directory
So ../ gets you one directory back not two.
Chain ../ as many times as necessary to go up 2 or more levels.
Try This
this example is one directory back
require_once('../images/yourimg.png');
this example is two directory back
require_once('../../images/yourimg.png');
following are ways to access your different directories:-
./ = Your current directory
../ = One directory lower
../../ = Two directories lower
../../../ = Three directories lower
You can do ../../directory/file.txt - This goes two directories back.
../../../ - this goes three. etc
But be VERY careful about letting a user select the file. You don't really want to allow them to get a file called, for example,
../../../../../../../../../../etc/passwd
or other sensitive system files.
(Sorry, it's been a while since I was a linux sysadmin, and I think this is a sensitive file, from what I remember)
if you include the / at the start of the include, the include will be taken as the path from the root of the site.
if your site is http://www.example.com/game/forum/files/index.php you can add an include to /includes/boot.inc.php which would resolve to http://www.example.com/includes/boot.inc.php .
You have to be careful with .. traversal as some web servers have it disabled; it also causes problems when you want to move your site to a new machine/host and the structure is a little different.