realpath
Description
string realpath ( string path)realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input path and return the canonicalized absolute pathname. The resulting path will have no symbolic link, '/./' or '/../' components.
realpath() returns FALSE on failure, e.g. if the file does not exists.
See also: basename(), dirname(), and pathinfo().