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   1  <?php
   2  /**
   3   * Appending the wp-block-heading to before rendering the stored `core/heading` block contents.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Adds a wp-block-heading class to the heading block content.
  10   *
  11   * For example, the following block content:
  12   *  <h2 class="align-left">Hello World</h2>
  13   *
  14   * Would be transformed to:
  15   *  <h2 class="align-left wp-block-heading">Hello World</h2>
  16   *
  17   * @since 6.2.0
  18   *
  19   * @param array  $attributes Attributes of the block being rendered.
  20   * @param string $content Content of the block being rendered.
  21   *
  22   * @return string The content of the block being rendered.
  23   */
  24  function block_core_heading_render( $attributes, $content ) {
  25      if ( ! $content ) {
  26          return $content;
  27      }
  28  
  29      $p = new WP_HTML_Tag_Processor( $content );
  30  
  31      $header_tags = array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' );
  32      while ( $p->next_tag() ) {
  33          if ( in_array( $p->get_tag(), $header_tags, true ) ) {
  34              $p->add_class( 'wp-block-heading' );
  35              break;
  36          }
  37      }
  38  
  39      return $p->get_updated_html();
  40  }
  41  
  42  /**
  43   * Registers the `core/heading` block on server.
  44   *
  45   * @since 6.2.0
  46   */
  47  function register_block_core_heading() {
  48      register_block_type_from_metadata(
  49          __DIR__ . '/heading',
  50          array(
  51              'render_callback' => 'block_core_heading_render',
  52          )
  53      );
  54  }
  55  
  56  add_action( 'init', 'register_block_core_heading' );