php获取页面的url和query_string
获取主机地址 host
$_SERVER['HTTP_HOST']; #www.lren.org
获取path
$_SERVER['PHP_SELF'] #/html/index.jsp
获取参数
$_SERVER["QUERY_STRING"]; #id=755&name=lren
获取代理
$_SERVER['HTTP_REFERER']
获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://www.lren.org:80/html/index.jsp?id=755&name=lren
