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Generate thumbnails with PHP by AR

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* Creates thumbnail from image
* thumbnail dimensions can be set as parameters
* accepts JPG, JPEG, GIF, PNG
* preserves transparency for GIF and PNG on thumbnails
* call function like this: createthumb(images/original.jpg, thumbs/thumb.jpg, 80, 80);

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  1. /**
  2.    * Function that creates thumbnail from image
  3.    * Original author: Christian Heilmann
  4.    * Fixed and extended: Ales Rebec
  5.    *
  6.    * @param $name       Original filename  (fullpath to image)
  7.    * @param $filename   Filename of the resized image (fullpath to thumbnail that will be created)
  8.    * @param $new_w      width of resized image in px (ex. 80 or 100)
  9.    * @param $new_h      height of resized image in px
  10.    */
  11.   public function createthumb($name,$filename,$new_w,$new_h)
  12.   {
  13.           $type = 0;
  14.           $size = getimagesize($name);
  15.           $mime = $size['mime'];                    //get image mime type (ex. "image/jpeg" or "image/gif")
  16.           $system=explode("/",$mime);
  17.           if (preg_match("/jpg|jpeg/i",$system[sizeof($system)-1])) {$type=1; $src_img=imagecreatefromjpeg($name);}
  18.           if (preg_match("/png/i",$system[sizeof($system)-1]))      {$type=2; $src_img=imagecreatefrompng($name);}
  19.           if (preg_match("/gif/i",$system[sizeof($system)-1]))      {$type=3; $src_img=imagecreatefromgif($name);}
  20.           $old_x=imageSX($src_img);
  21.           $old_y=imageSY($src_img);
  22.           if ($old_x > $old_y)                            //calculate thumnails dimenstions and preserve aspect ratio
  23.           {
  24.                   $thumb_w=$new_w;
  25.                   $thumb_h=$old_y*($new_h/$old_x);
  26.           }
  27.           if ($old_x < $old_y) 
  28.           {
  29.                   $thumb_w=$old_x*($new_w/$old_y);
  30.                   $thumb_h=$new_h;
  31.           }
  32.           if ($old_x == $old_y) 
  33.           {
  34.                   $thumb_w=$new_w;
  35.                   $thumb_h=$new_h;
  36.           }
  37.           $dst_img= imagecreatetruecolor($thumb_w,$thumb_h);          //create new image "canvas"
  38.           if($type > 1) $this->setTransparency($dst_img, $src_img);  //if GIF or PNG -> set tranparency
  39.           imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);
  40.           if      ($type == 3)  imagegif($dst_img,$filename); 
  41.           else if ($type == 2)  imagepng($dst_img,$filename); 
  42.           else                  imagejpeg($dst_img,$filename); 
  43.           imagedestroy($dst_img); 
  44.           imagedestroy($src_img); 
  45.   }

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