php resize ถามเกี่ยวกับ ลดขนาดรูปภาพเฉพาะรูปภาพที่เกินขนาดที่ตั้งไว้

$size=GetimageSize($images);
echo $size[0]; // width
echo $size[1]; // height

<?
	if(trim($_FILES["fileUpload"]["tmp_name"]) != "")
	{
		$images = $_FILES["fileUpload"]["tmp_name"];
		$new_images = "Thumbnails_".$_FILES["fileUpload"]["name"];
		copy($_FILES["fileUpload"]["tmp_name"],"MyResize/".$_FILES["fileUpload"]["name"]);
		$size=GetimageSize($images);
		if ($size[0] > 300) {
			$width=300; //*** Fix Width & Heigh (Autu caculate) ***//
			$height=round($width*$size[1]/$size[0]);
		} else {
			list($width, $height) = $size;
		}
		$images_orig = ImageCreateFromJPEG($images);
		$photoX = ImagesX($images_orig);
		$photoY = ImagesY($images_orig);
		$images_fin = ImageCreateTrueColor($width, $height);
		ImageCopyResampled($images_fin, $images_orig, 0, 0, 0, 0, $width+1, $height+1, $photoX, $photoY);
		ImageJPEG($images_fin,"MyResize/".$new_images);
		ImageDestroy($images_orig);
		ImageDestroy($images_fin);
	}
?>
<b>Original Size</b><br>
<img src="<?="MyResize/".$_FILES["fileUpload"]["name"];?>">
<hr>
<b>New Resize</b><br>
<img src="<?="MyResize/".$new_images;?>">