JavaScript -> PHP -> JavaScript

i have a problem with my site
that calls a php file by INCLUDE() witch connect to my server and
searches my database and return html by ECHO

I want to change it to JavaScript code to call that php file
and the php file to return JavaScript.

any idea how i can do that?

 

I read that it can be done if you add a header to the PHP file, so that it sends back Javascript instead of HTML. I'm not sure if this is right but here goes

PHP file:
<? Header('Content-Type: application/x-javascript')?>
Javascript code

Javascript to call the file:
<script type="text/javascript" src="filename.php"></script>

Code (markup):

 

You can do that by AJAX
http://www.w3schools.com/Ajax/ajax_example.asp

the example s using ASP but you can use PHP as well.

 

the thing is that the php file is not on the same server!