Is it JavaScript,HTML or PHP code?

Question

Is it JavaScript or PHP code:
<?
#<!--
echo "<script language='javascript'>alert('Your IP is ".$_SERVER['REMOTE_ADDR'].".');</script>";
#-->
?>

Answer 1

php

Answer 2

I'm not so sure but as far as I know javascript can be inserted regardless file extension. So I think it's javascript

Answer 3

it's php building javascript serverside t I'll then send to browser.