I am trying to add extra functionality to the CMS by calling the add_link function to add links to the top horizontal menu of the CMS.

One of these links link to a standalone PHP script which exists outside the Silverstripe framework.

The link in LeftAndMain.php is as follows

CMSMenu::add_link(
'RegisteredUsers',
'RegisteredUsers',
'module_my/code/show_members.php?status=1'
);

No GET variable is being sent to show_members.php. Indeed both $_REQUEST and $_SERVER['QUERY_STRING'] are empty.

Question: How can I retrieve the value of the GET variable in my show_members.php script?

Some more details

Something in my .htaccess file may be causing this. I see that this file contains the following lines.

<IfModule mod_rewrite.c>
SetEnv HTTP_MOD_REWRITE On
RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_URI} ^(.*)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .* sapphire/main.php?url=%1&%{QUERY_STRING} [L]
</IfModule>

However these lines are gibberish to me and I do not know how .htaccess and these lines get accessed.

Indeed inserting lines in sapphire/main.php just before the call to Director::direct($url); to print the value of $url to a log file inserted the following

admin
admin/EditorToolbar/ImageForm

I interpret this to mean that main.php is not being called after the link is clicked.

My external script contains the following code

<?php
include('My.php');
$myMy=new My();
$myMy->showMembers();
?>

My.php contains all my functions of which showMembers is one. My.php starts and ends with this

class My{
...
...
}

As you can see in my call to CMSMenu, My.php is located at root/module_my/code

I am using Silverstripe 2.4.