注意：这个问题与WordPress无关，而是直接与PHP相关，应该在StackOverflow 但我在下面提供了一个非常基本的答案，以帮助您实现目标。然而，请注意这个答案is not necessarily the best way 去解决你的问题，nor is it meant to be efficient.

// assuming get_the_content() equates to ↓

$content = \'<p class="1">P1 Content</p><p class="2">P2 Content</p><p class="3">P3 Content</p>\';

$classNames = [\'1\', \'2\', \'3\'];

$matches = [];

foreach( $classNames as $className ) {

    $pattern = sprintf(\'\\<p\\sclass=\\"%s\\"\\>(.*?)\\<\\/p\\>\', $className);

    preg_match("/{$pattern}/i", $content, $found); 

    $matches[] = $found;

}

var_dump($matches);

/*
array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(27) "<p class="1">P1 Content</p>"
    [1]=>
    string(10) "P1 Content"
  }
  [1]=>
  array(2) {
    [0]=>
    string(27) "<p class="2">P2 Content</p>"
    [1]=>
    string(10) "P2 Content"
  }
  [2]=>
  array(2) {
    [0]=>
    string(27) "<p class="3">P3 Content</p>"
    [1]=>
    string(10) "P3 Content"
  }
}
*/

更新1：

<p class="1">Content</p>
<p class="2">Content</p>
<!-- etc.. -->
<p class="234">Content</p>

$content = \'<p class="1">P1 Content</p><p class="2">P2 Content</p><p class="3">P3 Content</p>\';

$pattern = sprintf(\'\\<p\\sclass=\\"%s\\"\\>(.*?)\\<\\/p\\>\', \'[0-9]+\');

var_dump($pattern);

preg_match_all("/{$pattern}/i", $content, $found);

var_dump($found);

/*
array(2) {
  [0]=>
  array(3) {
    [0]=>
    string(27) "<p class="1">P1 Content</p>"
    [1]=>
    string(27) "<p class="2">P2 Content</p>"
    [2]=>
    string(27) "<p class="3">P3 Content</p>"
  }
  [1]=>
  array(3) {
    [0]=>
    string(10) "P1 Content"
    [1]=>
    string(10) "P2 Content"
    [2]=>
    string(10) "P3 Content"
  }
}
*/

/**
 * Iterate over the results (if any) and do something with the content.
 */
if ( is_array($found) && isset($found[1]) ) {

    foreach( $found[1] as $content ) {

        echo $content;

    }

}

P1 Content
P2 Content
P3 Content

<p class="myprefix-1">Content</p>
<p class="myprefix-2">Content</p>
<!-- etc.. -->
<p class="myprefix-234">Content</p>

$pattern = sprintf(\'\\<p\\sclass=\\"myprefix-%s\\"\\>(.*?)\\<\\/p\\>\', \'[0-9]+\');

REPL.IT DEMO

我找到了问题的解决方案，我想与大家分享：

为此，我只创建了一个php变量，并在参数中间添加了：

$sample = get_the_content(); 

$classes = \'1\';
<button class="accordion">
preg_match(\'/<p class="\'.$classes.\'">(.*?)<\\/p>/s\', $sample, $match); 
echo $match[1];

亲爱的“Adam”，这是我正在尝试做的，但我在数组长度上有问题。

$tkey = \'post-update\';

$update = new WP_Query(array(
    \'posts_per_page\' => -1,
    \'tag\' => $tkey
));

wp_reset_postdata();

if ($update->have_posts()) {
    while ($update->have_posts()) {
        $update->the_post();
        $sample = get_the_content();
    }
}

$classes = array();
array_push($classes, $match);

foreach ($classes as $names => $text) {

?>
    <button class="accordion">
        <?php
        preg_match(\'/<strong class="\' . $text . \'">(.*?)<\\/strong>/s\', $sample, $match);
        echo $match[1];
        ?>
    </button>
    <div class="panel">
        <p>
            <?php
            preg_match(\'/<p class="\' . $text . \'">(.*?)<\\/p>/s\', $sample, $match);
            echo $match[1];
            ?>
        </p>
    </div>
<?php } ?>
</div>