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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/tag-cloud` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/tag-cloud` block on server.
  10   *
  11   * @since 5.2.0
  12   *
  13   * @param array $attributes The block attributes.
  14   *
  15   * @return string Returns the tag cloud for selected taxonomy.
  16   */
  17  function render_block_core_tag_cloud( $attributes ) {
  18      $smallest_font_size = $attributes['smallestFontSize'];
  19      $unit               = ( preg_match( '/^[0-9.]+(?P<unit>[a-z%]+)$/i', $smallest_font_size, $m ) ? $m['unit'] : 'pt' );
  20  
  21      $args      = array(
  22          'echo'       => false,
  23          'unit'       => $unit,
  24          'taxonomy'   => $attributes['taxonomy'],
  25          'show_count' => $attributes['showTagCounts'],
  26          'number'     => $attributes['numberOfTags'],
  27          'smallest'   => floatVal( $attributes['smallestFontSize'] ),
  28          'largest'    => floatVal( $attributes['largestFontSize'] ),
  29      );
  30      $tag_cloud = wp_tag_cloud( $args );
  31  
  32      if ( empty( $tag_cloud ) ) {
  33          // Display placeholder content when there are no tags only in editor.
  34          if ( wp_is_serving_rest_request() ) {
  35              $tag_cloud = __( 'There&#8217;s no content to show here yet.' );
  36          } else {
  37              return '';
  38          }
  39      }
  40  
  41      $wrapper_attributes = get_block_wrapper_attributes();
  42  
  43      return sprintf(
  44          '<p %1$s>%2$s</p>',
  45          $wrapper_attributes,
  46          $tag_cloud
  47      );
  48  }
  49  
  50  /**
  51   * Registers the `core/tag-cloud` block on server.
  52   *
  53   * @since 5.2.0
  54   */
  55  function register_block_core_tag_cloud() {
  56      register_block_type_from_metadata(
  57          __DIR__ . '/tag-cloud',
  58          array(
  59              'render_callback' => 'render_block_core_tag_cloud',
  60          )
  61      );
  62  }
  63  add_action( 'init', 'register_block_core_tag_cloud' );