替换字符串的有关问题 _PHP

替换字符串的问题
不用js，想将替换字符串width="80" height="80",如何写呢？
传入字符串

HTML code


<img width="200" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg">

传出字符串

HTML code


<img width="80" height="80" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg">

------解决方案--------------------
echo str_replace('width="200"','width="80" height="80"',$str);
------解决方案--------------------

PHP code

<?php
$str='<img width="200" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg">';
echo preg_replace('/width="\d+"/','width="80" height="80"',$str);

------解决方案--------------------

如果要在前台展示的时候动态替换的话那就非js莫属了。
要是后台那就php处理吧