realpath() with empty path should return false

[mvorisek]

Description

All file functions, incl. dir functions like file_exists() or is_dir() return false when the input is empty.

One exception is realpath(), it returns the current directory when '' is given.

The reason is probably the way how realpath() is written, the path is probably checked if absolute and if not, it is appended to the current directory, even if empty.

After a fix, I expect realpath('') to return false.

It is probably not a bug, as documented so [1], but I propose this to be fixed to be consistent with other file functions.

[1] php/doc-en@5ca36de

[stramunin]

A small note. The above functions are boolean unlike realpath.

I just looked at how the standard function works and it returns an error on empty input. Maybe it's better to make it close to the implementation in C.

[hormus]

https://www.php.net/manual/en/function.realpath.php#refsect1-function.realpath-parameters $path empty string

[Girgias]

At best making those function throw a ValueError by first deprecating this behaviour makes more sense than this arbitrary change.

[iluuu1994]

I'm closing this, this should be discussed on the list.