PHP怎么获取当前网页URL地址

<?php $hts = $_SERVER["HTTPS"] == "on" ? "https://" : "http://";$url_this = $hts.''.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];?>

//放入FUNCTIONS 获取当前URL
function curPageURL() {
$pageURL = 'http://';
if ($_SERVER["HTTPS"] == "on") {
$pageURL= "https://";
}
if ($_SERVER["SERVER_PORT"] != "80") {
$pageURL = $pageURL.$_SERVER["SERVER_NAME"].
":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} else {
$pageURL = $pageURL.$_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
return $pageURL;
}

<?php echo curPageURL();?>