$_FILES參考說明
Element Contains Example
$ FILES['fupload']['name'] 文件名 test.gif
$_FILES['fupload']['tmp_name'] 臨時文件名 /tmp/asdfadsf
$_FILES['fupload']['size'] 文件大小 6835
$_FILES['fupload']['error'] 錯誤代碼 UPLOAD_ERR_FORM_SIZE
$_FILES['fupload']['type'] 文件類型 image/gif