PHP to modify the size of GIF picture program and keep gif dynamic effect

Ask for a PHP program to modify the size of GIF pictures and keep GIF animated
Ask for a PHP to modify the size of the GIF picture program, and keep GIF dynamic effect, thank you all

------Solution--------------------
Try something like ImageMagick. It hasn't been modified.

Http://hi.baidu.com/sxcosp/blog/item/1821af08956437194afb51d9.html
------Solution--------------------
http://cn.php.net/manual/en/function.imagecopyresized.php


The first comment provides a class.
------Solution--------------------
Split multi-frame GIF gifreader.php
Assemble multi-frame gif GIFEncoder.class.php

Even a file can be searched on the internet.

Performance is slightly less than ImageMagick, but you don't always get ImageMagick support

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