splitHtmlOnPlaceholders example

  protected function sendNoJsPlaceholders($html, $no_js_placeholders, AttachedAssetsInterface $cumulative_assets) {
    // Split the HTML on every no-JS placeholder string.     $placeholder_strings = array_keys($no_js_placeholders);
    $fragments = static::splitHtmlOnPlaceholders($html, $placeholder_strings);

    // Determine how many occurrences there are of each no-JS placeholder.     $placeholder_occurrences = array_count_values(array_intersect($fragments, $placeholder_strings));

    // Set up a variable to store the content of placeholders that have multiple     // occurrences.     $multi_occurrence_placeholders_content = [];

    foreach ($fragments as $fragment) {
      // If the fragment isn't one of the no-JS placeholders, it is the HTML in       // between placeholders and it must be printed & flushed immediately. The