PHP: How to get only the current folder of a website - php

Question

For example I have a website that points to a page like this:
http://www.mysite.com/folder/file
How can I get determine /folder so that I can go further an quote an if statement like
if /folder then echo something
Why do I need this?
I am trying to tell facebook which image to pick from a page. Actually I have a pretty simple page structure and the image that facebook should take is always at first but somehow it does choose another one from time to time. I guess because the other images are loaded faster. And the old way to rel="img_src" doesn't seem to work anymore as that I could just add it to the wanted image.
So well of course I use the open graph protocol to tell facebook which Image it should use.
I am working with a cms were I can output the path of the image depending on the id the image has. I have two different id's for the different kind of pages living in two different folders.
This leads to:
if index --> echo meta og for index img
else if /folderone (with id1) --> echo meta og for id1
else if /foldertwo (with id2) --> echo meta og for id2
This is why I need to know the foldername.
Now with the answer I have following setup, just that you know:
<?php $folder = dirname($_SERVER['SCRIPT_NAME']); ?>
<?php if (dirname($_SERVER['SCRIPT_NAME']) == "/") echo "<meta property='og:image' content='http://www.mysite.com/img/img.jpg'/>" ;?>
<?php if (dirname($_SERVER['SCRIPT_NAME']) == "/folderOne") echo "<meta property='og:image' content='http://www.mysite.com/img/{$img_id1}'/> " ;?>
<?php if (dirname($_SERVER['SCRIPT_NAME']) == "/folderTwo") echo "<meta property='og:image' content='http://www.mysite.com/img/{$img_id2}'/> " ;?>

Answer 1

parse_url &
explode
$path = parse_url($url, PHP_URL_PATH);
gives you
/folder/file
then you can explode() to separate the path values and check the first one to see if it is 'folder'
Example here: http://tehplayground.com/#7TIKAwp6J
Example code:
$url = "http://www.mysite.com/folder/file";
$path = parse_url($url, PHP_URL_PATH);
$arr = explode("/",$path);
echo $arr[1]; // leading slash makes [0] ""
outputs
folder

Answer 2

$script = $_SERVER['SCRIPT_NAME'];
echo dirname($script);

Answer 3

Possibly use "get current working directory" function getcwd()?
Explode it by directory separator.
Then grab the last element like this:
$var = getcwd();
$var = explode('\\', $var); // your OS might use '/' instead
$var = end($var);
I suppose this assumes you're not using some kind of MVC framework that uses routing.
I hope that helps!

Answer 4

I think this is nicer than exploding the string:
function getCurrentDirectory(){
$curDirPath = getcwd();
return substr($curDirPath, strrpos($curDirPath, '/') + 1);
}
getcwd() gives you the current directory's path, and then you can truncate it starting right after the last occurrence of the / in its file path.

Answer 5

$dir_list = explode('/', dirname($_SERVER['SCRIPT_FILENAME']));
$this_folder = $dir_list[count($dir_list)-1];
...
if ($this_folder) == "folderOne") echo "...."
...

Answer 6

if(dirname('yoursite/folder')){