Php retrieval path

: This article describes how to obtain php paths. For more information about PHP tutorials, see. Php retrieves the url path of the current page

# 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 the url parameter echo $ _ SERVER ["QUERY_STRING"]. ""; # id = 5 // obtain the user proxy echo $ _ SERVER ['http _ referer']. ""; // obtain the complete urlecho '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 // Complete urlecho 'http: // 'containing the port number ://'. $ _ SERVER ['server _ name']. ':'. $ _ SERVER ["SERVER_PORT"]. $ _ SERVER ["REQUEST_URI"]; # http: // localhost: 80/blog/testurl. php? Id = 5 // only the path $ url = 'http ://'. $ _ SERVER ['server _ name']. $ _ SERVER ["REQUEST_URI"]; echo dirname ($ url); # http: // localhost/blog

Php obtains the absolute path of the current file.

Usage tips,
Dirname (_ FILE _) obtains the absolute path of the current FILE, that is, the fastest search speed compared to the relative path.
If you repeat the command, you can raise the directory to a higher level:
For example: $ d = dirname (_ FILE __));
In fact, a directory is used as a parameter to dirname (), because the last Directory returned by dirname () does not contain \ or/
Therefore, we can think that dirname () treats the bottom directory as a file name.
The upper-level Directory of the current directory.
Include the files to obtain the upper-level Directory
Include (dirname (_ FILE _). '/../filename. php ');
The path of _ FILE _ is the FILE where the current code is located.
Dirname (_ FILE _); the directory name at the top of the FILE is obtained.
Dirname (_ FILE _); the directory name of the FILE's layer is obtained.

The above describes the php retrieval path, including the content, and hopes to help those who are interested in the PHP Tutorial.