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make tumbnails on the fly

/ Published in: PHP
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  1. <?php
  2. function shutdown() {
  3. global $orig_image, $cropped_image, $resized_image;
  4. if($orig_image) { imagedestroy($orig_image); }
  5. if($cropped_image) { imagedestroy($cropped_image); }
  6. if($resized_image) { imagedestroy($resized_image); }
  7. }
  8. register_shutdown_function("shutdown");
  9. list($old_width, $old_height) = getimagesize("./". $_GET['image']);
  10. if(($_GET['width'] / $_GET['height']) > ($old_width / $old_height)) {
  11. $new_width = $_GET['width'];
  12. $new_height = $old_height * ($_GET['width'] / $old_width);
  13. } else {
  14. $new_width = $old_width * ($_GET['height'] / $old_height);
  15. $new_height = $_GET['height'];
  16. }
  17. $resized_image = imagecreatetruecolor($new_width, $new_height);
  18. $orig_image = imagecreatefromgif("./". $_GET['image']);
  19. imagecopyresampled($resized_image, $orig_image, 0, 0, 0, 0, $new_width, $new_height, $old_width, $old_height);
  20. $cropped_image = imagecreatetruecolor($_GET['width'], $_GET['height']);
  21. imagecopy($cropped_image, $resized_image, 0, 0, 0, 0, imagesx($resized_image), imagesy($resized_image));
  22. $black = imagecolorallocate($cropped_image, 0, 0, 0);
  23. imagerectangle($cropped_image, 0, 0, $_GET['width'] - 1, $_GET['height'] - 1, $black);
  24. header("Content-type: image/png");
  25. imagepng($cropped_image);
  26. ?>
  27.  
  28. To create a thumbnail with it:
  29.  
  30. <img src="path/to/thumbnailer.php?image=image.gif&width=50&height=50" alt="" />

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