Stuff

<?php

function res($newfile, $old, $maxWidth, $maxHeight) {
  file_put_contents($newfile, file_get_contents($old));
  $im = imagecreatefrompng($newfile);
  
  $width_o = imagesx($im);
  $height_o = imagesy($im);
  $ratio = $maxHeight / $height_o;
  $width  = $width_o * $ratio;
  $height = $maxHeight;
  if($width > $maxWidth) {
    $ratio = $maxWidth / $width;
    $height = $height * $ratio;
    $width = $maxWidth;
  }
  
  $ni = imagecreatetruecolor($width, $height);
  imagealphablending($ni, false);
  imagesavealpha($ni, true);
  $trans = imagecolorallocatealpha($ni, 255, 255, 255, 127);
  imagefilledrectangle($ni, 0, 0, $width, $height, $trans);
  
  imagecopyresampled($ni, $im, 0, 0, 0, 0, $width, $height, $width_o, $height_o);
  imagepng($ni, $newFile, 100);      
}

header("Content-Type: image/png");
$image = $_GET['im'];
$filename = "cache/thumb_".basename($image);
res($filename, $image, 100, 80);
echo file_get_contents($filename);
    
    

    
?>