The " ?, ?, ?, ? " works but not " ' " with " charset=UTF-8 ", why ?

[Apfelfrucht]

Ok, so i have not to solve it, and why at Imageshack, when i upload an image file named " O'Clock.jpg " with the " ' ", it works well and becames " oclock.jpg " where with my Upload PHP Form becames " o\'clock ", so what is the problem with my Upload PHP Form and how can i make it like Imageshack do ?

Is there a script or way to transform the " ' " automaticly like Imageshack does ?

Regards.