PHP中获取当前页面的完整URL

javascript实现：

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

PHP实现

#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 $_SERVER['HTTP_REFERER']."<br>"; 
//获取完整的urlecho 'http://'.$_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urlecho '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