How to send a variable to a php ?

Hello I have a page called index.php its a game made with C2 but in the foot of this same page I added a code in php. my question is when I select an object image for example picture1 it will send to the same page index.php an variable and after request it to inside to my code index.php for print in it.

---index.php----

game in Construct2:

picture1 (var1)

picture2 (var2)

Inside to my code php, how to request var1 or var2, I have it but I dont know how to send by C2.

<?php

$myvar= $_GET["var1"];

echo $myvar;

?>

----end index.php-----

I hope you understand me my english is poor :(

Thanks

Gustavo

There are examples (C2 and PHP) listed in the how do I FAQ under the section AJAX. (Ize's example if my memory is correct has a zip with a capx and php files)