#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

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