PHP获取当前页面URL函数

/* 获得当前页面URL开始 */
function curPageURL() {
$pageURL = 'http';
if ($_SERVER["HTTPS"] == "on") { // 如果是SSL加密则加上“s”
$pageURL .= "s";
}
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80") {
$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} else {
$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
return $pageURL;
}
/* 获得当前页面URL结束 */

//获取域名或主机地址
echo $_SERVER['HTTP_HOST']."
"; #localhost

//获取网页地址
echo $_SERVER['PHP_SELF']."
"; #/blog/testurl.php

//获取网址参数
echo $_SERVER["QUERY_STRING"]."
"; #id=5

//获取用户代理
echo $_SERVER['HTTP_REFERER']."
";

//获取完整的url
echo 'http://'.$_S**ERVE*R['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_*HOST'].$_SERVER['PHP_SEL**F'].'?'.$_SERVER['QUERY_STRING'];
#http://loc*alh**ost/blog/testurl.php?id=5

//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://l*ocalh*os*t:80/blog/testurl.php?id=5

//只取路径
$url='http://'.$_SERVE*R['SE*RVE*R_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url);
#http://*l**ocalhost/blog