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$upfile=$_FILES['upfile']['tmp_name'];
$upfile_name=$_FILES['upfile']['name'];
$upfile_size=$_FILES['upfile']['size'];
if($upfile){
$file_size_max = 2048*1024;
$dir1="../../../";
$dir = "xieke/public_html/tmp/";
if ($upfile_size > $file_size_max) {
echo "对不起，你上传的文件容量大于规定";
exit;
}
if (file_exists($dir1.$dir . $upfile_name)) {
Echo   "存在相同文件名的文件";
exit;
}
$extension = substr(strrchr($upfile_name, "."),1);
$newname=$uploadpath.date("ymd-tu-His").'.'.$extension;
if (!move_uploaded_file($upfile,$dir1.$dir.$newname)) {
echo "复制文件失败";
}
}