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<?php
class http {
function redirect($url) {
$url = http::absoluteUrl($url);
header("Location: " . $url);
echo "redirecting to: <a href='". $url . "'>$url</a>"; // just in case browser is fucked.
}
/**
* returns an absolute URL, regardless of what kind is passed in.
* http redirect technically requires an absolute URL, although in
* practice most browsers support redirects with just a path and not
* the full protocal://server:port/path
*/
function absoluteUrl($url) {
if ( isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") {
$protocal = "https://";
$goodport = "443";
$badprotocal = "http://";
}
else {
$protocal = "http://";
$goodport = "80";
$badprotocal = "https://";
}
if (isset($_SERVER["SERVER_PORT"]) && $_SERVER["SERVER_PORT"] != $goodport)
$port = ":" . $_SERVER["SERVER_PORT"];
else
$port = "";
if (http::startsWith($url, $protocal)) {
return $url;
}
elseif (http::startsWith($url, $badprotocal)) {
return $url; // that is ok, i guess
}
elseif (http::startsWith($url, "/")) {
return $protocal . $_SERVER['HTTP_HOST'] . $port . $url ;
}
else {
$ret = $protocal . $_SERVER['HTTP_HOST'] . $port;
if ( dirname($_SERVER['PHP_SELF']) != "/" )
$ret .= dirname($_SERVER['PHP_SELF']) . "/" . $url;
else
$ret .= "/" . $url;
return $ret;
}
}
function startsWith($haystack, $needle) {
return preg_match("'^" . addslashes($needle). "'",$haystack);
}
}
return;
?>
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