function custom_column_headings($defaults) {
  $defaults['heading_counts'] = 'Başlık Sayıları';
  return $defaults;
}
add_filter('manage_posts_columns', 'custom_column_headings');

function custom_column_content($column_name, $post_ID) {
  if ($column_name == 'heading_counts') {
    $content = get_post_field('post_content', $post_ID);
    $pattern = '/<(h2|h3|h4)>/';
    preg_match_all($pattern, $content, $matches);
    $h2_count = isset($matches[0]) ? count(array_filter($matches[0], function($match) { return $match === '<h2>'; })) : 0;
    $h3_count = isset($matches[0]) ? count(array_filter($matches[0], function($match) { return $match === '<h3>'; })) : 0;
    $h4_count = isset($matches[0]) ? count(array_filter($matches[0], function($match) { return $match === '<h4>'; })) : 0;
    echo "H2 Sayısı: $h2_count<br>";
    echo "H3 Sayısı: $h3_count<br>";
    echo "H4 Sayısı: $h4_count";
  }
}
add_action('manage_posts_custom_column', 'custom_column_content', 10, 2);