ขอความช่วยเหลือหน่อยครับ เกี่ยวกับการ upload file ภาษา php ครับ

<?php
if(!empty($upfile))
{

$flgDelete = unlink("../nationpdf/$flg");
    $fileinfo	= pathinfo($upfile['name']);
	$filetype	= $fileinfo['extension'];


	if($upfile['error']==0)
	{
		if($filetype!='pdf')
		{
			echo "<script>alert('please check filetype. please pdf only');history.back();</script>";
			exit ();
		}else
		{
			$newname = $code.".$filetype";
			move_uploaded_file($upfile['tmp_name'],"../nationpdf/$newname");
		}
			$sqls ="update program set p_name='$name',p_detial='$detial',ag_id = '$agent',p_day='$numday',p_statusdetial='$statusdetial',p_detialall='$detialall',ai_id='$air',p_file='$newname' where p_id ='$programid'";
			$q = $connect->query($sqls);
			
			echo "<script>alert('Complete');history.back();</script>";
	}
}else
{
		$sqls ="update program set p_name='$name',p_detial='$detial',ag_id = '$agent',p_day='$numday',p_statusdetial='$statusdetial',p_detialall='$detialall',ai_id='$air' where p_id ='$programid'";
			$q = $connect->query($sqls);
			
			echo "<script>alert('Complete');history.back();</script>";
}
?>