PHP获取当前页面url地址（域名、参数、路径）

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'].$_SERVER["REQUEST_URI"];
echo dirname($url);

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'].$_SERVER["REQUEST_URI"];
echo dirname($url);

来源：https://www.cnblogs.com/crxis/p/12519353.html

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