PHP path function Aggregation

String realpath (string $ path) of the PHP path function returns the normalized absolute path name.

Realpath () checks whether the target file (or folder) pointed to by $ path exists, which is equivalent to calling file_exists ($ path ).

If the target file exists and is not a symbolic connection ("shortcut" in windows), the absolute path name of the file is returned and does not contain '/. /'or '/.. /'.
If the target file is a symbolic connection or does not exist, realpath () returns FALSE.

String dirname (string $ path) of the PHP path function returns the directory section in the path.

Dirname () does not check whether the file (or folder) pointed to by $ path exists.

No matter whether the target file exists or not, the absolute path (directory part) of the file will be returned ).

Mixed pathinfo (string $ path [, int $ options]) of the PHP path function returns the file path information.

Dirname () does not check whether the file (or folder) pointed to by $ path exists.

Pathinfo () of the PHP path function returns an associated array containing path information, including the following array units: dirname, basename, filename, and possible extension.

The dirname and basename array elements are equivalent to the results returned by dirname () and basename.

String basename (string $ path [, string $ suffix]) returns the part of the file name in the path.

Basename () of the PHP path function does not check whether the file (or folder) pointed to by $ path exists.

Regardless of whether the target file exists, the file name is returned.
If the file name ends with $ suffix, the returned file name does not contain $ suffix.