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/sangsir/manito.php?id=1

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

//获取网页地址
echo $_SERVER['PHP_SELF']; #/sangsir/manito.php

//获取网址参数
echo $_SERVER["QUERY_STRING"]; #id=1

//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; //第一种
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']; //第二种
#http://localhost/sangsir/manito.php?id=1

//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://localhost:80/sangsir/manito.php?id=1

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