php上传文件程序

<form method="post" action="?a=add" enctype="multipart/form-data">
<input type="file" name="names" /><input type="submit" value="avc" />
</form>
<?php
if($_REQUEST["a"]=="add")
{
$upfile=$_FILES['names'];
$upname1=iconv('utf-8','GBK',$upfile['name']);//获得文件的名称，type：为图片类型，size：图片大小。
$path1="upload_img/".$upname1;
switch($_FILES['names']['type'])
{
case"application/octet-stream"://上传rar文件
move_uploaded_file($_FILES['names']['tmp_name'],$path1);
break;
case "application/x-zip-compressed": //上传zip文件
move_uploaded_file($_FILES['names']['tmp_name'],$path1);
break;
case "text/plain": //上传文本文件
move_uploaded_file($_FILES['names']['tmp_name'],$path1);
break;

}
}
?>