findMinLevel($headings); return $this->buildRecursive($headings, 0, $min_level); } private function findMinLevel(array $headings): int { $levels = array_column($headings, 'level'); return !empty($levels) ? min($levels) : 1; } private function buildRecursive(array $headings, int $index, int $current_level): string { $html = '

'; $count = count($headings); while ($index < $count) { $heading = $headings[$index]; if ($heading['level'] < $current_level) { break; } if ($heading['level'] === $current_level) { $html .= sprintf( '
• %s', esc_attr($heading['level']), esc_attr($heading['anchor']), esc_html($heading['clean_text']) ); $index++; if ($index < $count && $headings[$index]['level'] > $current_level) { $nested_html = $this->buildRecursive($headings, $index, $current_level + 1); $html .= $nested_html; while ($index < $count && $headings[$index]['level'] > $current_level) { $index++; } } $html .= '
'; continue; } if ($heading['level'] > $current_level) { $nested_html = $this->buildRecursive($headings, $index, $current_level + 1); $html .= $nested_html; while ($index < $count && $headings[$index]['level'] >= $current_level + 1) { $index++; } } } $html .= '

'; return $html; } }