Livestatus HTML PHP Code Help

[GDI121]

Hello Guys i've written a small code just to get the Livestatus but its not working. Im not rly good with html and PHP so pls Help me if you know whats wrong with the Code:

<form action="http://x*mychannel*x.api.channel.livestream.com/2.0/livestatus.xml" method="get">
<?php
if ('isLive == true') {
    Live stream is online!;
}
else {
    Live stream is offline!;
}
?>

Thanks for the Help!