PHP include help

Why does this work:

<?php include "in开发者_如何转开发cludes/top_nav.php"; ?>

and why does this not work for me?

<?php include "http://localhost/includes/top_nav.php"; ?>

URL fopen wrappers is probably disabled on that server

http://www.php.net/manual/en/filesystem.configuration.php#ini.allow-url-fopen

I see two likely reasons.

First, your server may not be configured to allow URL file access. The error in that case would read, "URL file-access is disabled in the server configuration"

If the include actually works, but doesn't include what you expect, though, that's a whole other story. In that case, the key to understand is how such a request gets processed. While executing the script you shared, your server will perform an HTTP request (to itself) and ask for the output of top_nav.php. This is an entirely new request to the server, so the details about the original request are no longer in play.

The request will be coming from a different user (i.e., Apache) at a different IP address (i.e., your server's address, as opposed to the original client's), with different cookies, with different $_GET data and no $_POST data.

Thus, if top_nav.php in any way examines server variables, environment variables, PHP variables, or any other runtime state when rendering, this will fail.

You need to enable URL fopen wrappers as said in the documentation, and even if it's enabled, it doesn't work with Windows.

From PHP docs

If "URL fopen wrappers" are enabled in PHP (which they are in the default configuration), you can specify the file to be included using a URL (via HTTP or other supported wrapper - see List of Supported Protocols/Wrappers for a list of protocols) instead of a local pathname.

What is the value of URL fopen wrappers on your server?