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Resize Images on the fly

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Creating thumbnails of the images is required many a times, this code will be useful to know about the logic of thumbnail generation.

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  1. /**********************
  2. *@filename - path to the image
  3. *@tmpname - temporary path to thumbnail
  4. *@xmax - max width
  5. *@ymax - max height
  6. */
  7. function resize_image($filename, $tmpname, $xmax, $ymax)
  8. {
  9. 	$ext = explode(".", $filename);
  10. 	$ext = $ext[count($ext)-1];
  11.  
  12. 	if($ext == "jpg" || $ext == "jpeg")
  13. 		$im = imagecreatefromjpeg($tmpname);
  14. 	elseif($ext == "png")
  15. 		$im = imagecreatefrompng($tmpname);
  16. 	elseif($ext == "gif")
  17. 		$im = imagecreatefromgif($tmpname);
  18.  
  19. 	$x = imagesx($im);
  20. 	$y = imagesy($im);
  21.  
  22. 	if($x <= $xmax && $y <= $ymax)
  23. 		return $im;
  24.  
  25. 	if($x >= $y) {
  26. 		$newx = $xmax;
  27. 		$newy = $newx * $y / $x;
  28. 	}
  29. 	else {
  30. 		$newy = $ymax;
  31. 		$newx = $x / $y * $newy;
  32. 	}
  33.  
  34. 	$im2 = imagecreatetruecolor($newx, $newy);
  35. 	imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
  36. 	return $im2;
  37. }

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