Resizing Image (create thumbnail) on ftp_put - php

Question

So I have a simple goal but I can't seem to get the one part to work.
1) Upload an image and create 3 different sizes: LG, MD, SM; then rename images.
2) Move the images from server/website A to server/website B.
I have the uploading and renaming working for all three images, but I can't figure out what I'm doing wrong with the re-sizing part. Any help would be greatly appreciated.
Note: I am currently trying to just get one image to resize, I figured one at a time would be smartest to make sure I understand what is happening.
Code:
function thumb_resize_image_new($source, $destination, $image_type, $max_size, $image_width, $image_height, $quality){
if($image_width <= 0 || $image_height <= 0){return false;} //return false if nothing to resize
//do not resize if image is smaller than max size
if($image_width <= $max_size && $image_height <= $max_size){
return true;
}
//Construct a proportional size of new image
$image_scale = min($max_size/$image_width, $max_size/$image_height);
$new_width = ceil($image_scale * $image_width);
$new_height = ceil($image_scale * $image_height);
$new_canvas = imagecreatetruecolor( $new_width, $new_height ); //Create a new true color image
imagealphablending($new_canvas,true);
$success = imagecopyresampled($new_canvas, $source, 0, 0, 0, 0, $new_width, $new_height, $image_width, $image_height);
return true;
}
if(isset($_POST['sendFile'])) {
$image_name = $_FILES['image_file']['name']; //file name
$destination_folder = "folder/";
$sm_square_size = 300; //Thumbnails will ! be cropped
$sm_prefix = "_sm"; //Small thumb Prefix
$md_square_size = 600; //Thumbnails will ! be cropped
$md_prefix = "_md"; //Medium thumb Prefix
$max_image_size = 1200; //Maximum image size (height and width)
$lg_prefix = "_lg"; //Large thumb Prefix
$jpeg_quality = 90; //jpeg quality
if($image_name != "") {
$image_size = $_FILES['image_file']['size']; //file size
$image_temp = $_FILES['image_file']['tmp_name']; //file temp
$image_size_info = getimagesize($image_temp); //get image size
//echo "Image ".$image_name." Uploaded. ";
if($image_size_info){
$image_width = $image_size_info[0]; //image width
$image_height = $image_size_info[1]; //image height
$image_type = $image_size_info['mime']; //image type
} else {
die("Make sure image file is valid!");
}
//switch statement below checks allowed image type
//as well as creates new image from given file
switch($image_type){
case 'image/png':
$image_res = imagecreatefrompng($image_temp); break;
case 'image/gif':
$image_res = imagecreatefromgif($image_temp); break;
case 'image/jpeg': case 'image/pjpeg':
$image_res = imagecreatefromjpeg($image_temp); break;
default:
$image_res = false;
}
if($image_res){
//Get file extension and name to construct new file name
$image_info = pathinfo($image_name);
$image_extension = strtolower($image_info["extension"]); //image extension
$image_name_only = strtolower($image_info["filename"]);//file name only, no extension
$dateRec = date('d-M-Y-h-i-s');
//create a random name for new image (Eg: fileName_293749.jpg) ;
$new_file_name = $dateRec. '_' . rand(0, 9999);
$thumb_name = $new_file_name.$sm_prefix.'.'.$image_extension;
$medium_name = $new_file_name.$md_prefix.'.'.$image_extension;
$large_name = $new_file_name.$lg_prefix.'.'.$image_extension;
$thumb_path = $destination_folder.$thumb_name;
$medium_path = $destination_folder.$medium_name;
$large_path = $destination_folder.$large_name;
$ftp_server = "";
$ftp_conn = ftp_connect($ftp_server) or die("Could not connect to $ftp_server");
$ftp_username = "";
$ftp_userpass = "";
$login_conn = ftp_login($ftp_conn, $ftp_username, $ftp_userpass) or die("Could not connect to ftp login");
if((!$ftp_conn) || (!$login_conn)) {
print "FTP connection failed!"; exit();
} else {
// upload a file
if(thumb_resize_image_new($image_res, $image_temp, $image_type, $md_square_size, $image_width, $image_height, $jpeg_quality)) {
echo "thumb created. $success <br />";
} else {
die('Error Creating thumbnail: '.$thumb_path.'<br />');
}
if(ftp_put($ftp_conn, $thumb_path, $image_temp, FTP_BINARY)) {
echo "Successfully uploaded $thumb_name <hr />";
} else {
echo "There was a problem while uploading $thumb_name into $thumb_path <hr />";
}
if(ftp_put($ftp_conn, $medium_path, $image_temp, FTP_BINARY)) {
echo "Successfully uploaded $medium_name <hr />";
} else {
echo "There was a problem while uploading $medium_name into $medium_path <hr />";
}
if(ftp_put($ftp_conn, $large_path, $image_temp, FTP_BINARY)) {
echo "Successfully uploaded $large_name <hr />";
} else {
echo "There was a problem while uploading $large_name into $large_path <hr />";
}
}
ftp_close($ftp_conn);
}
}
}
If anyone knows how to help fix this, or a better way of doing it, I'd forever be thankful!