php 生成缩略图的示例，需要GD2 library

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<?php
/**
 * GD2 library，生成缩略图
 *
 * @param 
 * @arrange （www.idcnote.com）
 **/
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);
}


/*** 来自：php教程（www.idcnote.com） ***/ 
?>

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