如何替换最后的HTML列表项？ [英] How to replace the last HTML list item?

问题描述

如何替换此字符串中最后一个 li 元素？

How do I replace the last li element in this string?

之前：

$var = 
   '<li>anything<li/>
    <li>anything<li/>
    <li>anything<li/>
    <li>anything<li/>
    <li>anything<li/>';

后：

After:

$var = 
   '<li>anything<li/>
    <li>anything<li/>
    <li>anything<li/>
    <li>anything<li/>
    <li class="foo">anything<li/>';

我尝试了 preg_replace（）：

preg_replace('<li>', '<li class="foo">', $var);

但它不是预期的输出。

But it isn't the expected output. How do I change the code to get the expected output?

推荐答案

这应该适合您：

（这里我只是将字符串拆分为一个数组，其中 explode（） ，然后替换最后一个元素和 implode（） 将它再次转换为字符串。 $ b

(Here I just split the string into an array with explode(), then I replace the last element and implode() it again to a string. BTW: You closed the li tags wrong)

<?php

    $var = 
        '<li>anything</li>
        <li>anything</li>
        <li>anything</li>
        <li>anything</li>
        <li>anything</li>';

    $var = explode(PHP_EOL, $var);
    $var[count($var)-1] = preg_replace("/<li.*?>(.*?)<\/li>/", "<li class='foo'>$1</li>", $var[count($var)-1]);
    $var = implode(PHP_EOL, $var);

    print_r($var);

?>

输出：

output:

<li>anything</li>
<li>anything</li>
<li>anything</li>
<li>anything</li>
<li class='foo'>anything</li>

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