PHP: Get current directory index file name - php

Question

I must not be phrasing this question right because I couldn't find an answer to this but surely it's been asked before. How do I get the current filename from a URL if it's the directory's index file?
I.e. This will get index.html if I'm on www.example.com/index.html
$url = basename($_SERVER['REQUEST_URI']);
But that won't work if i'm on www.example.com. The only thing I've come up with so far is something like this:
$url = basename($_SERVER['REQUEST_URI']);
if($url == "") {
$filename = "index.html";
}
But that's obviously a bad solution because I may actually be on index.htm or index.php. Is there a way to determine this accurately?

Answer 1

$_SERVER['SCRIPT_FILENAME'] will determine the full path of the currently executing PHP file. And $_SERVER['SCRIPT_NAME'] returns just the file name.

Answer 2

This is one of the other methods.
$url = basename($_SERVER['REQUEST_URI']);
$urlArray = explode("/",$url));
$urlArray = array_reverse($urlArray);
echo $urlArray[0];

Answer 3

Unfortunately, the $_SERVER array entries may not always be available by your server. Some may be omitted, some not. With a little testing though, you can easily find out what your server will output for these entries. On my servers (usually Apache) I find that $_SERVER['DOCUMENT_ROOT'] usually gets me the base of the URI I'm after. This also works well for me in the production environment I work on (XAMPP). As my URI will have a localhost root. I have seen people encourage DOCUMENT_ROOT before in this situation. You can read all about the $_SERVER array here.
In this example, I get the following results:
echo $_SERVER['DOCUMENT_ROOT'] ; // outputs http://example.com
If you are working in a production environment this is very helpful because you won't have to modify your URL's when you go live:
echo $_SERVER['DOCUMENT_ROOT'] ; // outputs C:/xampp/htdocs/example
'DOCUMENT_ROOT' The document root directory under which the current
script is executing, as defined in the server's configuration file.

Answer 4

You could find the last occurrence of the slash / using strrchr() and simply extract the rest using substr(). The optional parameter in substr() tells where to begin. With one we skip the slash /. If you want to keep it, just set the parameter to 0.
echo substr( strrchr( "http://example.com/index.html" , "/" ) , 1 ) ; // outputs index.html
EDIT: Considering that not every server will provide $_SERVER with entities, my approach might be more reliable. That is, if the URL you pass to strrchr() is reliable. In either case, make sure you test the different outputs from $_SERVER, or your paths you provide.