PHP从一台服务器变为另一台服务器

I am pretty new to php.

I have two websites: Site1 has a code that counts the characters in the domain name. So I have:

echo count($letters);

This works great. What I need is to take this variable and echo it on Site2. How can I do that? Site2 is on a different server.

very easy and straight forward solution is

$content = file_get_contents('http://ww.google.com');
echo $content;

and replace google link with your other server link