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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/image` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/image` block on the server,
  10   * adding a data-id attribute to the element if core/gallery has added on pre-render.
  11   *
  12   * @param  array  $attributes The block attributes.
  13   * @param  string $content    The block content.
  14   * @return string Returns the block content with the data-id attribute added.
  15   */
  16  function render_block_core_image( $attributes, $content ) {
  17      if ( isset( $attributes['data-id'] ) ) {
  18          // Add the data-id="$id" attribute to the img element
  19          // to provide backwards compatibility for the Gallery Block,
  20          // which now wraps Image Blocks within innerBlocks.
  21          // The data-id attribute is added in a core/gallery `render_block_data` hook.
  22          $data_id_attribute = 'data-id="' . esc_attr( $attributes['data-id'] ) . '"';
  23          if ( false === strpos( $content, $data_id_attribute ) ) {
  24              $content = str_replace( '<img', '<img ' . $data_id_attribute . ' ', $content );
  25          }
  26      }
  27      return $content;
  28  }
  29  
  30  
  31  /**
  32   * Registers the `core/image` block on server.
  33   */
  34  function register_block_core_image() {
  35      register_block_type_from_metadata(
  36          __DIR__ . '/image',
  37          array(
  38              'render_callback' => 'render_block_core_image',
  39          )
  40      );
  41  }
  42  add_action( 'init', 'register_block_core_image' );