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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/paragraph` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Append the `wp-block-paragraph` class before rendering the stored
  10   * `core/paragraph` block contents.
  11   *
  12   * For example, the following block content:
  13   *  <p class="align-left">Hello World</p>
  14   *
  15   * Would be transformed to:
  16   *  <p class="align-left wp-block-paragraph">Hello World</p>
  17   *
  18   * @since 7.0.0
  19   *
  20   * @param string $block_content The block content.
  21   *
  22   * @return string Filtered block content.
  23   */
  24  function block_core_paragraph_add_class( $block_content ) {
  25      if ( ! $block_content ) {
  26          return $block_content;
  27      }
  28  
  29      $processor = new WP_HTML_Tag_Processor( $block_content );
  30  
  31      if ( $processor->next_tag( 'p' ) ) {
  32          $processor->add_class( 'wp-block-paragraph' );
  33      }
  34  
  35      return $processor->get_updated_html();
  36  }
  37  
  38  add_filter( 'render_block_core/paragraph', 'block_core_paragraph_add_class' );
  39  
  40  /**
  41   * Registers the `core/paragraph` block on server.
  42   *
  43   * @since 7.0.0
  44   */
  45  function register_block_core_paragraph() {
  46      register_block_type_from_metadata( __DIR__ . '/paragraph' );
  47  }
  48  add_action( 'init', 'register_block_core_paragraph' );