I need some help with concepts and terminology regarding website 'root' urls and directories.
Is it possible to determine a website's root, or is that an arbitrary idea, and only the actual server's root can be established?
Let's say I'm writing a PHP plugin that that will be used by different websites in different locations, but needs to determine what the website's base directory is. Using PHP, I will always be able to determine the DOCUMENT_ROOT and SERVER_NAME, that is, the absolute URL and absolute directory path of the server (or virtual server). But I can't know if the website itself is 'installed' at the root directory or in a sub directory. If the website was in a subdirectory, I would need the user to explicitly set an "sub-path" variable. Correct?
The root directory is the folder that is accessed when internet users type the domain name of a website into the search bar of their browser. When a website with an index. html file in the root directory is called up, the index. html file is displayed in the browser.
Finding the Document Root A domain's document root, also known as the home folder, is the main folder that contains all of the files for either a domain or a subdomain. The document root for your main domain name is your public_html folder.
Answer to question 1: Yes you need a variable which explicitly sets the root path of the website. It can be done with an htaccess file at the root of each website containing the following line :
SetEnv APP_ROOT_PATH /path/to/app
http://httpd.apache.org/docs/2.0/mod/mod_env.html
And you can access it anywhere in your php script by using :
<?php $appRootPath = getenv('APP_ROOT_PATH'); ?>
http://php.net/manual/en/function.getenv.php
Will $url and $dir always be pointing to the same place?
Yes
<?php
$some_relative_path = "hello";
$server_url = $_SERVER["SERVER_NAME"];
$doc_root = $_SERVER["DOCUMENT_ROOT"];
echo $url = $server_url.'/'. $some_relative_path."<br />";
echo $dir = $doc_root.'/'. $some_relative_path;
Output:
sandbox.phpcode.eu/hello
/data/sandbox//hello
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