thumbnails.php

<?php
/**
*Crea thumb.
*/
function make_thumb($src, $dest,$type, $desired_width) {
  try{
    if($type=="png"){
      $source_image =imagecreatefrompng($src);
      $width = imagesx($source_image);
      $height = imagesy($source_image);
      $desired_height = floor($height * ($desired_width / $width));
      $virtual_image = imagecreatetruecolor($desired_width, $desired_height);
      imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
      imagepng($virtual_image, $dest);}
    else{
      $source_image =imagecreatefromjpeg($src);
      $width = imagesx($source_image);
      $height = imagesy($source_image);
      $desired_height = floor($height * ($desired_width / $width));
      $virtual_image = imagecreatetruecolor($desired_width, $desired_height);
      imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
      imagejpeg($virtual_image, $dest);
    }
  } catch (Exception $e) {
    die('Caught exception: '.$e->getMessage());
  }
};

?>