resize landscape and portrait picture

[web_master]

hi, my problem is:

 

if I was upload the picture and in  meantime resize itt, what can I do to dont chage the radio of the photographs if its portrait or landscape:

 

examlpe :

 

portrait = 600 x 800

landscape = 800 x 600

 

with this code will be:

 

landscape = 800 x 600

 

portrait = 600 x 450

 

here is the code wich made the resize of picture percentagle of width or height.

 

<?php
$temporary_name = $_SERVER['DOCUMENT_ROOT']."/up_product_photo_main/temp_01.jpg";
move_uploaded_file($_FILES['product_photo']['tmp_name'][1], $temporary_name);

$mimetype = $_FILES['product_photo']['type'][1];
$filesize = $_FILES['product_photo']['size'][1];

//Open the image using the imagecreatefrom..() command based on the MIME type.
switch($mimetype) {
case "image/jpg":
case "image/jpeg":
	$i = imagecreatefromjpeg($temporary_name);
	break;
case "image/gif":
	$i = imagecreatefromgif($temporary_name);
	break;
case "image/png":
	$i = imagecreatefrompng($temporary_name);
	break;
}

//Delete the uploaded file
unlink($temporary_name);

//Save a copy of the original
imagejpeg($i, $_SERVER['DOCUMENT_ROOT']."/up_product_photo_main/_photo_01.jpg",80);

//Specify the size of the thumbnail
$dest_x = 127;
$dest_y = 95;

//Is the original bigger than the thumbnail dimensions?
if (imagesx($i) > $dest_x or imagesy($i) > $dest_y) {

//Is the width of the original bigger than the height?
if (imagesx($i) >= imagesy($i)) {
	$thumb_x = $dest_x;
	$thumb_y = imagesy($i)*($dest_x/imagesx($i));
} else {
	$thumb_x = imagesx($i)*($dest_y/imagesy($i));
	$thumb_y = $dest_y;
}
} else {
//Using the original dimensions
$thumb_x = imagesx($i);
$thumb_y = imagesy($i);
}

//Generate a new image at the size of the thumbnail
$thumb = imagecreatetruecolor($thumb_x,$thumb_y);

//Copy the original image data to it using resampling
imagecopyresampled($thumb, $i ,0, 0, 0, 0, $thumb_x, $thumb_y, imagesx($i), imagesy($i));

//Save the thumbnail
imagejpeg($thumb, $_SERVER['DOCUMENT_ROOT']."/up_product_photo_main/photo_01.jpg", 80);

unlink($_SERVER['DOCUMENT_ROOT']."/up_product_photo_main/_photo_01.jpg");

?>