在WordPress3.5/3.5.1中，对图片的处理多了几个文件，不再是单一的media.php了，其中有：
…wp-includesclass-wp-image-editor.php 负责对图片进行基本处理；
…wp-includesclass-wp-image-editor-gd.php 负责对图片用GD（graphic device，图像工具库）调整；
…wp-includesclass-wp-image-editor-imagick.php 负责对图片用Imagick（调用ImageMagick功能的PHP扩展）进行调整；
各文件的头部备注说明信息（都是“@since 3.5.0”）
class-wp-image-editor.php
/**
* Base WordPress Image Editor
*
* @package WordPress
* @subpackage Image_Editor
*/
/**
* Base image editor class from which implementations extend
*
* @since 3.5.0
*/
class-wp-image-editor-gd.php
/**
* WordPress GD Image Editor
*
* @package WordPress
* @subpackage Image_Editor
*/
/**
* WordPress Image Editor Class for Image Manipulation through GD
*
* @since 3.5.0
* @package WordPress
* @subpackage Image_Editor
* @uses WP_Image_Editor Extends class
*/
class-wp-image-editor-imagick.php
/**
* WordPress Imagick Image Editor
*
* @package WordPress
* @subpackage Image_Editor
*/
/**
* WordPress Image Editor Class for Image Manipulation through Imagick PHP Module
*
* @since 3.5.0
* @package WordPress
* @subpackage Image_Editor
* @uses WP_Image_Editor Extends class
*/
