PHP的str_replace与通配符? [英] PHP str_replace with wild card?

问题描述

我知道如何将str_replace用于诸如此类的简单任务...

I know how to use str_replace for simple tasks, like this...

$Header = str_replace('<h2>Animals</h2>', '<h3>Animals</h3>', $Header);

但是，假设存储在数据库中的文章包含以下标题:

But imagine an article stored in a database that includes the following headers:

<h3>Animals</h3>
<h3>Plants</h3>

您想将它们更改为此:

<h3><span class="One">Animals</span></h3>
<h3><span class="One">Plants</span></h3>

是否有办法将标签(例如动物，植物，矿物等)之间的值转换为通配符，就像这样?

Is there a way to turn the value between the tags (e.g. Animals, Plants, Minerals, etc.) into a wild card, something like this?:

$Title = str_replace('<h3>*</h3>', '<h3><span style="One">*</span></h3>', $Title);

或者我应该问:最好的方法是什么?"看来有很多方法可以做到，但是我想尝试着找到一个简单的PHP解决方案，然后再开始使用正则表达式.

Or I should ask "What's the best way?" It looks like there are ways to do it, but I'd like to try and find a simple PHP solution before I start wrestling with regular expressions.

推荐答案

您可以使用主要注释中建议的str_replace()技术，但我相信

You can use the str_replace() technique that has been suggested in the primary comments, but I believe preg_replace() using regular expressions is the best practice for wildcard replacements.

<?php
$str = <<<EOD

<h3>Animals</h3>
<h3>Plants</h3>

EOD;

$str = preg_replace('/<h3>(.*?)<\/h3>/', '<h3><span class="One">$1</span></h3>', $str);

echo $str;

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