Understanding PHP dirname (__file__)

Assuming that the current file is stored under (d:\www\), the file name is test.php. Assuming that the current file is stored under (d:\www\), the file name is test.php. Copy the Code code as follows: Note: dirname (__file__) takes the absolute path of the current file, and the lookup speed is the fastest compared to the relative path. If you can repeat the directory up one level at a time: for example: $d = DirName (dirname (__file__)), in fact, a directory to DirName () to do the parameters. Because DirName () returns the last directory without \ \ or/So it can be assumed that dirname () treats the lowest-level directory as a file name. Return to the parent directory of the current directory as usual, so that it gets the top level of the directory in duplicate. Files that contain the previous level of the directory: Copy the Code Code as follows: Include (DirName (__file__). /.. /filename.php ');

