utf 8 - Make PHP pathinfo() return the correct filename if the filename is UTF-8

Question

When using PHP's pathinfo() function on a filename known to be UTF-8, it does not return the correct value, unless there are 'normal' characters in front of the special character.

Examples:
pathinfo('a?.pdf')returns:

Array
(
[dirname] => [the dir]
[basename] => a?.pdf
[extension] => pdf
[filename] => a?
)  

which is fine and dandy, but pathinfo('?a.pdf')returns:

Array
(
[dirname] => [the dir]
[basename] => a.pdf
[extension] => pdf
[filename] => a
)  

Which is not quite what I was expecting. Even worse, pathinfo('?.pdf')returns:

Array
(
[dirname] => [the dir]
[basename] => .pdf
[extension] => pdf
[filename] => 
)  

Why does it do this? This goes for all accented characters I have tested.

Answer 1

before usage pathinfo

setlocale(LC_ALL,'en_US.UTF-8');
pathinfo($OriginalName, PATHINFO_FILENAME);
pathinfo($OriginalName, PATHINFO_BASENAME);