Php include then grab end of current URL and combine them -

i trying include file based on current page of url user on.

the files stored in /includes/ in cases , on same domain.

if current url user on example:

www.website.com/page/text_i_want.php?info=tree

<?php $url = curpageurl();?><?php include ("{$_server['document_root']}/includes.'/'.$id = substr( $url, strrpos( $url, '/' )+1"  ?>

this have if did work, would't remove after , including .php , add .txt end

i want grab text_i_want end of url (not including dynamic part) , add .txt end including:

{$_server['document_root']}/includes/text_i_want.txt

i keep getting ';' error , syntax error, unexpected t_echo have.

update:

<?php include $_server['document_root'] . '/includes/' . basename($_server['request_uri'], '?'.$_server['query_string']); ?>

that code grabs file name @ end of url, want. unsure how replace .php .txt

i think need:

<?php include $_server['document_root'] . '/includes/' . basename(__file__, '.php') . '.txt'; ?>

update

according update, try $_server['request_uri'] php docs says: "the uri given in order access page; instance, '/index.html'".

if not want, give read on php server variables

And