php获取网址

 1 #测试网址:     http://localhost/blog/testurl.php?id=5
 2 
 3 //获取域名或主机地址 
 4 echo $_SERVER[‘HTTP_HOST‘]."<br>"; #localhost
 5 
 6 //获取网页地址 
 7 echo $_SERVER[‘PHP_SELF‘]."<br>"; #/blog/testurl.php
 8 
 9 //获取网址参数 
10 echo $_SERVER["QUERY_STRING"]."<br>"; #id=5
11 
12 //获取用户代理 
13 echo $_SERVER[‘HTTP_REFERER‘]."<br>"; 
14 
15 //获取完整的url
16 echo ‘http://‘.$_SERVER[‘HTTP_HOST‘].$_SERVER[‘REQUEST_URI‘];
17 echo ‘http://‘.$_SERVER[‘HTTP_HOST‘].$_SERVER[‘PHP_SELF‘].‘?‘.$_SERVER[‘QUERY_STRING‘];
18 #http://localhost/blog/testurl.php?id=5
19 
20 //包含端口号的完整url
21 echo ‘http://‘.$_SERVER[‘SERVER_NAME‘].‘:‘.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; 
22 #http://localhost:80/blog/testurl.php?id=5
23 
24 //只取路径
25 $url=‘http://‘.$_SERVER[‘SERVER_NAME‘].$_SERVER["REQUEST_URI"]; 
26 echo dirname($url);
27 #http://localhost/blog