#Test URL: http://localhost/blog/testurl.php?id=5
//Get the domain name or host address
echo $_SERVER['HTTP_HOST']."
"; #localhost
//Get the web page address
echo $_SERVER['PHP_SELF']."
"; #/blog/testurl.php
//Get URL parameters
echo $_SERVER["QUERY_STRING"]."
"; #id=5
//Get the user agent
echo $_SERVER['HTTP_REFERER']."
";
//Get the complete url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF' ].'?'.$_SERVER['QUERY_STRING'];
#http://localhost/blog/testurl.php?id=5
//Full url including port number
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://localhost:80/blog/ testurl.php?id=5
//Get only the path
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url);
#http://localhost/blog
javascript implementation:
top.location.href The address of the top-level window
this.location.href The address of the current window