เกี่่ยวกับอัพโหลดรูปภาพแล้วปรับขนาดอัตโนมัติ มีปัญหาดังนี้

if ($photo) {
	$array_last=explode(".",$photo_name);
	$s=count($array_last)-1; 
	$lastname=strtolower($array_last[$s]) ;
	if ($lastname == "jpg" or $lastname== "jpeg" or $lastname =="png" or $lastname=="gif") {
		$sql2="select max(id) from store ";
		$result2=mysql_db_query($dbname,$sql2);
		$row=mysql_fetch_row($result2);
		$filename=$row[0].".".$lastname;
	if ($lastname =="jpg" or $lastname =="jpeg") {
		$ori_img = imagecreatefromjpeg($photo);
	} else if ($lastname =="png") {
		$ori_img = imagecreatefrompng($photo);
	} else if ($lastname =="gif") {
		$ori_img = imagecreatefromgif($photo);
	}
	$ori_size = getimagesize($photo);
	$ori_w = $ori_size[0];
	$ori_h = $ori_size[1];
	if ($ori_w>=$ori_h) {
		$new_w = 300; 
		$new_h = round(($new_w/$ori_w) * $ori_h);
	} else {
		$new_h =300; 
		$new_w = round(($new_h/$ori_h) * $ori_w); 
	}
	$new_img= imagecreatetruecolor($new_w, $new_h);
	imagecopyresized(	$new_img, $ori_img,0,0,0,0,$new_w, $new_h,$ori_w,$ori_h);
	if ($lastname =="jpg" or $lastname =="jpeg") {
		imagejpeg($new_img,"images/$filename");
	} else if ($lastname =="png") {
		imagepng($new_img,"images/$filename");
	} else if ($lastname =="gif") {
		imagegif($new_img,"images/$filename");
	}
	imagedestroy($ori_img); 
	imagedestroy($new_img); 
	$sql="update store set pic='$filename' where id ='$row[0]' ";
	mysql_db_query($dbname,$sql);
	}		
	unlink($photo);
	}