Add IDs to all headings on a page in WordPress

See how to set the ID attribute for a heading, based on the heading content.

September 2, 2023 wordpressphpgutenberg

Add a ID attribute for all heading

add_filter('the_content', 'add_id_attribute_to_headings');

function add_id_attribute_to_headings($content): string {
  return preg_replace_callback('#<(h[1-6])(.*?)>(.*?)</(h[1-6])>#', 'add_id_attribute_to_heading_callback', $content);

function add_id_attribute_to_heading_callback($match): string {
  [$full, $el_start, $attributes, $content, $el_end] = $match;

  if (str_contains($full, ' id="')) {
    return $full;

  $id = sanitize_title_with_dashes($content);
  return '<{$el_start} id="{$id}" {$attributes}>{$content}</{$el_end}>';

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