PHP Realpath dirname

About PHP Realpath and dirname many times will be merged to use, has not been remembered, in need of time to go to the Internet to check data, so record here, easy to find later

DirName returns the directory portion of the path parameter (that is, the path removes the last file or directory)

Example: DirName ('/path/foo/bar/index.php '); Return to/path/foo/bar here

DirName ('/path/foo/bar '); Return to/path/foo here

Realpath returns the normalized absolute pathname (simply put the/./and/... in the path). /all removed, change to absolute path, but note that there will be no output when the directory or file does not exist

Example: Realpath ('./test/class/.  /'); (At this point the php file is under/var/www/html) here return/var/www/html/test

Realpath ('/windows/system32 '); (on window) here to return to C:\WINDOWS\System32