I need to create a login page with HTTPS to yahoo
Do I have to have a valid certificate?

I have  not trust certification centre, so before anything under HTTPS will
be shown up, the window will come with information: valid certificate: yes,
valid domain: yes, valid authority for SSL key: no.
 am I right?
<?php
//if not on HTTPS
if(empty($_SERVER['HTTPS'])) {
//build link to https page; protocol, server and current script path
$url = "Location: https://www.yahoo.com/";;
//addy querystring, if appropriate
if(count($_GET) != 0) {
$url .= "?";
foreach($_GET as $key => $value) {
$url .= "$key=$value&";
}
}
//send permanent move redirect
header($url, true, 301);
}
?>
but it goes to http://www.yahoo.com

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