How to generate image thumbnails in php_PHP tutorial

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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 */

imagecopyresized($virtual_image,$source_image,0,0,0,0,$desired_width,$desired_height,$width,$height);

/* create the physical thumbnail image to its destination */

imagejpeg($virtual_image,$dest, 83);

}