Suppose, I have an index.php file like this:
<?php
$id=2;
include('php/config.php');
require_once "php/variables.php";
?>
Is there any way to pass the variable $id via url parameter to config.php and variables.php files so that I can perform some tasks based on the variable after getting it by $_GET['id']?
You can use $id in both file, because you are already including those two file in your current file so you can able to access $id, try to print echo $id; in both files and you can see the value.
Yes, You can directly access $id in both files as saied by Karthik. Or you can use global variables
include('php/config.php'); require_once "php/variables.php";
The include and require_once functions, take a filesystem path by default; not a URL. Consequently "URL parameters" (and the corresponding $_GET superglobal) are irrelevant here, because you are not passing a URL.
(Yes, you can pass a URL to these functions if you have the appropriate fopen wrappers set and this will trigger an HTTP request - but this is most probably not what you want to do here.)
The include and require_once functions include the referenced document in-place and therefore inherit the current scope. Consequently the $id variable will be available as-is to these included scripts (as the other answers have already pointed out).
