在第一个html标记内使用php代码的惯例是什么？

Question

I was referring the page.tpl.php(Drupal 7 theme) for understanding the code. I found the following code,

<?php if ($site_name || $site_slogan): ?>
        <!-- !Site name and Slogan -->
        <div<?php print $hgroup_attributes; ?>>

          <?php if ($site_name): ?>
            <h1<?php print $site_name_attributes; ?>><?php print $site_name; ?></h1>
          <?php endif; ?>

          <?php if ($site_slogan): ?>
            <h2<?php print $site_slogan_attributes; ?>><?php print $site_slogan; ?></h2>
          <?php endif; ?>

        </div>
<?php endif; ?>

Can you see the code in third line, <div<?php print $hgroup_attributes; ?>> <div<?php print $hgroup_attributes; ?>> WHY the php code is inside the first div tag of html? Same thing in later part of code also, as you can see h1 and h2 code. So, what is this convention of combining the html and php in so complicated way? and how should I read that?

Answer 1

Combining HTML and PHP code in Drupal templates is actually a very strong feature. In this case, $hgroup_attributes will probably contain some classes that style the div . Printing it in the template results in something like

<div class="SOME_CLASSES"> ... </div>

If you're further interested in the variable $hgroup_attributes , you can inspect by pasting <?php dpm($hgroup_attributes); ?> <?php dpm($hgroup_attributes); ?> in your template file after you've installed the Devel module.