替换字符串的有关问题

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

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<img     style="max-width:90%" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg" alt=" 替换字符串的有关问题 " ><script src="https://www.php.cn/hezuo/f220a8ffcae8732bbc8e3d8f7f36834b.js"></script>

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HTML code

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<img     style="max-width:90%"  style="max-width:90%" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg" alt=" 替换字符串的有关问题 " >

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PHP code

<?php $str='<img     style="max-width:90%" src="http://www.macaucentral.com/dev/images/stories/jreviews/649_Image00001_1304589016.jpg" alt=" 替换字符串的有关问题 " ><script src="https://www.php.cn/hezuo/f220a8ffcae8732bbc8e3d8f7f36834b.js"></script>';
echo preg_replace('/width="\d+"/','width="80" height="80"',$str);
<br><font color="#e78608">------解决方案--------------------</font><br>
如果要在前台展示的时候动态替换的话那就非js莫属了。<br>要是后台那就php处理吧 <div class="clear"></div>

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