Image Thumbnails Using PHP

function make_thumb($src, $dest, $desired_width) {

 /* read the source image */
 $source_image = imagecreatefromjpeg($src);
 $width = imagesx($source_image);
 $height = imagesy($source_image);
 
 /* find the "desired height" of this thumbnail, relative to the desired width  */
 $desired_height = floor($height * ($desired_width / $width));
 
 /* create a new, "virtual" image */
 $virtual_image = imagecreatetruecolor($desired_width, $desired_height);
 
 /* copy source image at a resized size */
 imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
 
 /* create the physical thumbnail image to its destination */
 imagejpeg($virtual_image, $dest);
}