PHP to obtain the complete URL of the current page

PHP to obtain the complete URL of the current page javascript implementation:
Top. location. href top-level window address
This. location. href address of the current window

PHP implementation # test URL: http: // localhost/blog/testurl. php? Id = 5

// Obtain the domain name or host address
Echo $ _ SERVER ['http _ host']."
"; # Localhost

// Obtain the webpage address
Echo $ _ SERVER ['php _ SELF ']."
"; #/Blog/testurl. php

// Obtain URL parameters
Echo $ _ SERVER ["QUERY_STRING"]."
"; # Id = 5

// Obtain the user proxy
Echo $ _ SERVER ['http _ referer']."
";

// Obtain the complete url
Echo 'http: // '. $ _ SERVER ['http _ host']. $ _ SERVER ['request _ url'];
Echo 'http: // '. $ _ SERVER ['http _ host']. $ _ SERVER ['php _ SELF']. '? '. $ _ SERVER ['query _ string'];
# Http: // localhost/blog/testurl. php? Id = 5

// Complete url containing the port number
Echo 'http ://'. $ _ SERVER ['server _ name']. ':'. $ _ SERVER ["SERVER_PORT"]. $ _ SERVER ["REQUEST_URI"];
# Http: // localhost: 80/blog/testurl. php? Id = 5

// Only take the path
$ Url = 'http: // '. $ _ SERVER ['server _ name']. $ _ SERVER ["REQUEST_URI"];
Echodirname ($ url );
# Http: // localhost/blog