如何使用bootstrap和php在不同的行中设置不同的未来文章样式？

<div class="container">
  <div class="row">
    <div class="col-md-6">
      <h2>文章标题1</h2>
      <p>文章内容1</p>
    </div>
    <div class="col-md-6">
      <h2>文章标题2</h2>
      <p>文章内容2</p>
    </div>
  </div>
  <div class="row">
    <div class="col-md-6">
      <h2>文章标题3</h2>
      <p>文章内容3</p>
    </div>
    <div class="col-md-6">
      <h2>文章标题4</h2>
      <p>文章内容4</p>
    </div>
  </div>
</div>

<div class="container">
  <?php
    // 假设这是从数据库中获取的文章数据
    $articles = [
      ['title' => '文章标题1', 'content' => '文章内容1', 'type' => '类型A'],
      ['title' => '文章标题2', 'content' => '文章内容2', 'type' => '类型B'],
      ['title' => '文章标题3', 'content' => '文章内容3', 'type' => '类型A'],
      ['title' => '文章标题4', 'content' => '文章内容4', 'type' => '类型B']
    ];

    foreach ($articles as $article) {
      if ($article['type'] == '类型A') {
        echo '<div class="row">';
        echo '<div class="col-md-6">';
        echo '<h2 class="样式A">' . $article['title'] . '</h2>';
        echo '<p>' . $article['content'] . '</p>';
        echo '</div>';
        echo '</div>';
      } else {
        echo '<div class="row">';
        echo '<div class="col-md-6">';
        echo '<h2 class="样式B">' . $article['title'] . '</h2>';
        echo '<p>' . $article['content'] . '</p>';
        echo '</div>';
        echo '</div>';
      }
    }
  ?>
</div>