<?php

// Generate target dimensions (we want to keep the AR)
function genimgdim($max_x, $max_y, $orig_x, $orig_y) {
    if ($orig_x > $orig_y) {
        $dim['x'] = $max_x;
        $dim['y'] = ($max_x / $orig_x) * $orig_y;
        if ($dim['y'] > $max_y) {
            $dim['x'] = ($max_y / $orig_y) * $orig_x;
            $dim['y'] = $max_y;
        }
    } elseif ($orig_x < $orig_y) {
        $dim['x'] = ($max_y / $orig_y) * $orig_x;
        $dim['y'] = $max_y;
        if ($dim['x'] > $max_x) {
            $dim['x'] = $max_x;
            $dim['y'] = ($max_x / $orig_x) * $orig_y;
        }
    } else {
        if ($max_x > $max_y) {
            $dim['x'] = $max_y;
            $dim['y'] = $max_y;
        } else {
            $dim['x'] = $max_x;
            $dim['y'] = $max_x;
        }
    }
    return $dim;
}