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Check first parent of page in Wordpress and add body id

/ Published in: PHP
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Copy this code and paste it in your HTML 
  1. <?php
  2. if ( is_page() && $post->post_parent ) {
  3. $id = get_the_ID();
  4. $a = get_ancestors( $id, 'page' );
  5. $root=count($a)-1;
  6. $rootId = $a[$root];
  7. }
  8. else {
  9. $rootId = get_the_ID();
  10. }
  11. ?>
  12.  
  13.  
  14. <body <?php body_class(); ?> id="root-id-<?php echo $rootId ?>">

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