#测试网址: http://localhost/blog/testurl.php?id=5
//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://'.$_SERVER['HTTP_HOST'].$_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'].$_SERVER["REQUEST_URI"];
echodirname($url);
#http://localhost/blog
