如何从PHP非标记代码中提取标记值？

我需要得到第四个H4标签值 HTML代码如下所示：

                  <div class="col-md-6 mb-6 mb-md-3">
                    <h3 class="mb-3">testing 1</h5>
                    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
                  </div>

                  <div class="col-md-6 mb-6 mb-md-3">
                    <h3 class="mb-3">testing 2 </h5>
                    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
                  </div>

                  <div class="col-md-6 mb-6 mb-md-3">
                    <h3 class="mb-3">testing 3</h5>
                    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
                  </div>

                  <div class="col-md-6 mb-6 mb-md-3">
                    <h3 class="mb-3">testing</h5>
                    <h4 class="mb-0 abcd defg hikjk lmnop">**Needed this Value only**</h4>
                  </div>

$html->find（'h4'）作为$h4）

---

$value=$h4->？？？？；-->值应该是多少？？？

PHP有一个内置的DOM解析器，您不需要第三方库来进行简单的查找：

<?php

$input = '<div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 1</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 2 </h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 3</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">**Needed this Value only**</h4>
  </div>';

$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($input);
libxml_use_internal_errors(false);

var_dump($dom->getElementsByTagName('h4')[3]->nodeValue);

---

尝试使用JS-DOM方法，尤其是选择器，或者你做过任何研究并尝试过吗？这是否回答了你的问题？同样好的，下面是我正在寻找的上下文：$html=newsimple_html_dom（）；$html->load（$content）$html->find（'h1'）为$myLink$h1=$myLink->？？？？？？？；请让我知道它的价值
<?php

$input = '<div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 1</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 2 </h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing 3</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">Not needed this Value</h4>
  </div>

  <div class="col-md-6 mb-6 mb-md-3">
    <h3 class="mb-3">testing</h5>
    <h4 class="mb-0 abcd defg hikjk lmnop">**Needed this Value only**</h4>
  </div>';

$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($input);
libxml_use_internal_errors(false);

var_dump($dom->getElementsByTagName('h4')[3]->nodeValue);