PHP를 통해 현재 페이지 URL 기능을 얻는 방법

/* 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[&#39;HTTP_HOST&#39;]."<br>"; #localhost 
 
//获取网页地址  
echo $_SERVER[&#39;PHP_SELF&#39;]."<br>"; #/blog/testurl.php 
 
//获取网址参数  
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5 
 
//获取用户代理  
echo $_SERVER[&#39;HTTP_REFERER&#39;]."<br>"; 
 
//获取完整的url 
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;REQUEST_URI&#39;]; 
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].&#39;?&#39;.$_SERVER[&#39;QUERY_STRING&#39;]; 
#http://localhost/blog/testurl.php?id=5 
 
//包含端口号的完整url 
echo &#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].&#39;:&#39;.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];  
#http://localhost:80/blog/testurl.php?id=5 
//只取路径 
$url=&#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].$_SERVER["REQUEST_URI"];  
echo dirname($url); 
#http://localhost/blog