include() function in PHP?

Question

PHP

I just can’t figure it out ... Regardless of whether the following happens on the local machine or on a virtual server:
On the local server
Included: Not included: On the remote server Included: Not included: On the local server (file in the directory) Included: Not included:
<? include("functions.php"); ?>
<? include("http://localhost/functions.php"); ?>
<? include("functions.php"); ?>
<? include("http://site.ru/functions.php"); ?>
<? include("./dir/functions.php"); ?>

<? include("http://localhost/dir/functions.php"); ?>

On a remote server (a file in a directory)
Included: Not included: I read the manuals, it says that the includes only work non-locally. Here it turns out the other way around... I need to include exactly by the file address ( site.ru/functions.php), and not relative.
<? include("./dir/functions.php"); ?>
<? include("http://site.ru/dir/functions.php"); ?>

Answer 1

In php.ini, the allow_url_include setting should be On. Just don't forget about safety.

Answer 2

do not want to include deleted files,
there are certainly alternative ways to solve the problem.
include only local files

Answer 3

I use $_SERVER['DOCUMENT_ROOT']it and I don't know any troubles)))

Answer 4

if there is no access to php.ini, then you can add a line to .htaccess - php_value allow_url_include On

Answer 5

I read manuals, it is said that inclusions work only non-locally.

What kind of manuals are these?