<?php
// 说明：获取完整URL

function curPageURL() 
{
  $pageURL = 'http';

  if ($_SERVER["HTTPS"] == "on") 
  {
    $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;
}
?>

<?php
 echo curPageURL();
?>

<?php
// 说明：获取无参数URL

function curPageURL() 
{
  $pageURL = 'http';

  if ($_SERVER["HTTPS"] == "on") 
  {
    $pageURL .= "s";
  }
  $pageURL .= "://";

  $this_page = $_SERVER["REQUEST_URI"];
  
  // 只取 ? 前面的内容
  if (strpos($this_page, "?") !== false)
  {
    $this_pages = explode("?", $this_page);
    $this_page = reset($this_pages);
  }

  if ($_SERVER["SERVER_PORT"] != "80") 
  {
    $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $this_page;
  } 
  else 
  {
    $pageURL .= $_SERVER["SERVER_NAME"] . $this_page;
  }
  return $pageURL;
}
?>

<?php
// 说明：获取无参数URL

function curPageURL() 
{
  $pageURL = 'http';

  if ($_SERVER["HTTPS"] == "on") 
  {
    $pageURL .= "s";
  }
  $pageURL .= "://";

  if ($_SERVER["SERVER_PORT"] != "80") 
  {
    $pageURL .= $_SERVER["SERVER_NAME"].":" . $_SERVER["SERVER_PORT"] . $_SERVER['PHP_SELF'];
  } 
  else 
  {
    $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER['PHP_SELF'];
  }
  return $pageURL;
}
?>

<?php
// 说明：获取 _SERVER['REQUEST_URI'] 值的通用解决方案
function request_uri()
{
  if (isset($_SERVER['REQUEST_URI']))
  {
    $uri = $_SERVER['REQUEST_URI']; 
  }
  else
  {
    if (isset($_SERVER['argv']))
    {
      $uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['argv'][0];
    }
    else
    {
      $uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['QUERY_STRING'];
    }
  }
  return $uri;
}
?>

<?php
/**
 * 获取当前页面完整URL地址
 */
function get_url() {
  $sys_protocal = isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://';
  $php_self = $_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME'];
  $path_info = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
  $relate_url = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $php_self.(isset($_SERVER['QUERY_STRING']) ? '?'.$_SERVER['QUERY_STRING'] : $path_info);
  return $sys_protocal.(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '').$relate_url;
}
 
echo get_url();
?>

top.location.href  顶级窗口的地址
this.location.href 当前窗口的地址

#测试网址:   http://localhost/blog/testurl.php?id=5
//获取域名或主机地址 
echo $_SERVER['HTTP_HOST']."<br>"; #localhost

//获取网页地址 
echo $_SERVER['PHP_SELF']."<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['HTTP_REFERER']."<br>"; 

//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
#http://localhost/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://localhost:80/blog/testurl.php?id=5

//只取路径
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]; 
echo dirname($url);
#http://localhost/blog