This class provides an advanced file uploader system for file uploads made from html forms. it features: handling from one file to multiple files, safe file copying from tmp dir, easy detecting mechanism of valid upload, missing upload or error, giving extensive information about the uploaded file, renaming uploaded files in different ways (as it is, safe or unique), validating allowed file extensions, multiple languages error messages support (es, en, de, fr, it, nl, pt_br).