Tracking Xml file request from php

I have htaccess file

SetEnvIf X-Real-IP "1.1.1.1|2.2.2.2" allowclient 
order deny,allow 
deny from all 
Allow from env=allowclient

So i grant access to thoose IP

In directory i have Xml files.

Now I need to track how often and which IP request each Xml file.

I know that i can do this with php but have to do this with Xml files?

I trying to write code in Htaccess

RewriteEngine on  
RewriteRule (.*)\.xml(.*) $1.php$2 [nocase]  

in 1.php

   <?php
   file_put_contents("1.txt", "\n"."REAL_IP=" .@$_SERVER['HTTP_X_REAL_IP']."\n\t" ."Time:".date('Y-m-d H:i:s',@$_SERVER['REQUEST_TIME'])."\n---------------------------------------------------------------------------------------", FILE_APPEND);
    include '1.xml';
    ?>

But i get error

Parse error: syntax error, unexpected 'version' (T_STRING) in

So i need to track data and return the same xml file to end users without changing link to file.