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   1  <?php
   2  /**
   3   * Block visibility block support flag.
   4   *
   5   * @package WordPress
   6   * @since 6.9.0
   7   */
   8  
   9  /**
  10   * Render nothing if the block is hidden.
  11   *
  12   * @since 6.9.0
  13   * @access private
  14   *
  15   * @param string $block_content Rendered block content.
  16   * @param array  $block         Block object.
  17   * @return string Filtered block content.
  18   */
  19  function wp_render_block_visibility_support( $block_content, $block ) {
  20      $block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
  21  
  22      if ( ! $block_type || ! block_has_support( $block_type, 'blockVisibility', true ) ) {
  23          return $block_content;
  24      }
  25  
  26      if ( isset( $block['attrs']['metadata']['blockVisibility'] ) && false === $block['attrs']['metadata']['blockVisibility'] ) {
  27          return '';
  28      }
  29  
  30      return $block_content;
  31  }
  32  
  33  add_filter( 'render_block', 'wp_render_block_visibility_support', 10, 2 );