In my header.php how do I show a banner on every page other than the home page?

Hello, can anyone help, I need to know what code to add that checks to see if its the website home page, and if its not shows a banner.

Thanks

 

worked it out, thought I'd share below

To show on every page apart from home use the below

<?php
$homepage = "/";
$currentpage = $_SERVER['REQUEST_URI'];
if($homepage<>$currentpage) {
echo 'Adcode here' ;
}
?>

use the below for the code to appear on the home page only

<?php
$homepage = "/";
$currentpage = $_SERVER['REQUEST_URI'];
if($homepage==$currentpage) {
echo 'Adcode here' ;
}
?>

 

Thanks for the code