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Question

Tell from where a .php file has been included?

Answer 1

+4 A:

So you want to distinguish between:

<link type="text/css" rel="stylesheet"
  href="http://example.com/path/to/php-file.php" />

<script type="text/javascript"
  src="http://example.com/path/to/php-file.php"&gt;&lt;/script&gt;

Or simply opening http://example.com/path/to/php-file.php in a browser.

There's no flag set in these cases to distinguish how the file was called. You can examine the $_SERVER array by doing <?php print_r($_SERVER); ?> and they should be identical in each case.

I take it you're adding ?mode=css or ?mode=js to the end of the url -- that seems like a logical way to switch what kind of output you want. Then in the code you can do:

  $mode = (isset($_GET['mode']) ? $_GET['mode'] : '';
  switch ($mode):
    case 'css':
      // css
    break;
    case 'js':
      // js
    break;
    default:
      // default
  endswitch;

artlung 2009-11-06 16:03:24

Cheers, but that's what I'm doing right now by "setting a flag" (maybe I was not clear enough, sorry). I'm looking for an automatic, reliable way just to un-clutter the code a bit.

Pekka 2009-11-06 16:13:15

Sorry, as Piskvor says in their answer, each request from the browser is simply a `GET` request. There's no magic context provided. HTTP requests are stateless, which I think is **why** no context can be read by PHP. More about statelessness here: http://www.yafla.com/dennisforbes/-Web-Apps-Suck-Because-HTTP-is-Stateless-/-Web-Apps-Suck-Because-HTTP-is-Stateless-.html

artlung 2009-11-06 16:23:34

Thanks, that was what I was looking to confirm (or have contradicted).

Pekka 2009-11-06 16:45:00

Answer 2

+3 A:

If I understand you correctly, you have a page which calls itself, (like this):

<?php // page.php
if (is_called_as_js()) {
    header('Content-Type: text/javascript;charset=utf-8');
    echo "alert('hello');";
    exit;
} elseif (is_called_as_css()) {
    header('Content-Type: text/css');
    echo 'body { color: green }';
    exit;
}
?>
<html>
(...)
<script src="page.php"></script>
<link rel="stylesheet" href="page.php" />

In that case, no, there's no way to tell - the browser sends a request saying GET /page.php. No intent is mentioned - just "give me the page and the browser will decide what to do with it". (yeah, yeah, there is Accept and whatnot, haven't seen a modern browser actually using this feature to say "give me this page as CSS", most just say Accept: */*)

If you insist that all your output, be it JS, CSS, or HTML, should be generated with one file, I suggest an URL rewriter (assuming Apache HTTP server, this would be mod_rewrite; most platforms offer this functionality in some way or another). Example using mod_rewrite:

# .htaccess
RewriteEngine On
RewriteRule ^css/(.*) /page.php?type=css&file=$1 [L]
RewriteRule ^js/(.*) /page.php?type=js&file=$1 [L]

This way, request to /css/style.css will look like page.php?type=css&file=style.css when your script is run, similarly for /js/foobar.js.

(Technically, you're still using GET variables to find out if the result is supposed to be HTML,JS,or CSS; but it's not visible to the users, plus you get around some older browsers' limitation "if query string, don't cache or cache brokenly")

Piskvor 2009-11-06 16:04:01

The product I am developing must be able to run on other platforms as well, so mod_rewrite is not an option. Still a good idea. +1

Pekka 2009-11-06 16:14:27

Most platforms include some form of URL rewriting, I've used mod_rewrite as I'm familiar with it.

Piskvor 2009-11-06 16:33:45

Yes, but many (most) shared hosting providers have it turned off for performance reasons.

Pekka 2009-11-06 16:45:33

@Pekka I don't know that most shared hosting providers disable url rewriting. I don't have data, but all the shared hosting providers I can think of that are LAMP include .htaccess ability, along with the ability to do mod_rewrite calls. Think: wordpress, drupal and other standard CMS that require it for pretty urls.

artlung 2009-11-06 16:56:04

@artlung: Most don't, but still many do; I'd default to pretty URLs and give an option in the config to use your (artlung's) solution.

Piskvor 2009-11-06 17:15:14

Answer 3

+1 A:

No.

There isnt really any reason why you should need to do this though. Either you should have very differnt php files being called as css or js files or you should pass get parameters. They way you layout your code should make this unambiguous.

Toby Allen 2009-11-06 16:23:22

See the clarification edited above.

Pekka 2009-11-06 16:43:56

Answer 4

A:

Although it's not entirely clear to me why you'd want to generate such different filetypes through a single script, you could use different wrappers:

 <?php // js.php
 define('TYPE','javascript');
 require('page.php');
 ?>


 <?php // css.php
 define('TYPE','css');
 require('page.php');
 ?>


 <?php // page.php
 if (!defined('TYPE')) {
    ?>
    <script src="js.php"></script>
    <link rel="stylesheet" href="css.php" />
    <?php
 } else if (TYPE == 'javascript') {
    header('Content-Type: text/javascript;charset=utf-8');
    ?>
    alert('hello');
    <?php
 } else if (TYPE == 'css') {
    header('Content-Type: text/css');
    ?>
    BODY { color: red }
    <?php
 }
 ?>

You're still getting to page.php in the end, but you now know with what intent.

Piskvor 2009-11-06 16:30:03

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Tell from where a .php file has been included?

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