Php resize function works on width, but not length - php

Question

I have been using the function below to resize image, but realized it does not work on images that are longer then the width. Current Image I'm testing is 1200 x 1800 and is 248kb. With this image the function does nothing to it. When loaded into the directory it not only is the same size 1200 x 1800, but is also still 248kb. I have simplfied the code and tested the code below and sure enough it's giving the same results. Any ideas?
function resize_image($file, $max_resolution){
if(file_exists($file)){
$original_image = imagecreatefromjpeg($file);
//resolution
$original_width = imagesx($original_image);
$original_height = imagesy($original_image);
//try width first
$ratio = $max_resolution / $original_width;
$new_width = $max_resolution;
$new_height = $original_height * $ratio;
//If that didnt work
if($new_height > $max_resolution){
$ratio = $max_resolution / $original_height;
$new_height = $max_resolution;
$new_width = $original_width * ratio;
}
if($original_image){
$new_image = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($new_image,$original_image,0,0,0,0,$new_width,$new_height,$original_width,$original_height);
imagejpeg($new_image,$file,90);
}
}
}
if($_SERVER['REQUEST_METHOD'] == "POST"){
if(isset($_FILES['image']) && $_FILES['image']['type'] == 'image/jpeg'){
print_r($_FILES);
move_uploaded_file($_FILES['image']['tmp_name'], $_FILES['image']['name']);
$file = $_FILES['image']['name'];
resize_image($file, "500");
echo "<img src='$file'/>";
}
}
?>