php url 相关

// 获取域名或主机地址
echo "HTTP_HOST==> ".$_SERVER['HTTP_HOST']."<br>"; #localhost

//获取网页地址
echo "PHP_SELF==> ".$_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php

//获取网址参数
echo "QUERY_STRING==> ".$_SERVER["QUERY_STRING"]."<br>"; #id=5

//获取用户代理
echo "HTTP_REFERER==> ".$_SERVER['HTTP_REFERER']."<br>";

//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']."<br>";

echo '获取完整的url: http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']."<br>";
#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"]."<br>";
#http://localhost:80/blog/testurl.php?id=5

//只取路径
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]."<br>";

echo dirname($url);