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replacePlaceholders example

$env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->getDefaultEnv(), $env, 'strcasecmp') : $this->getDefaultEnv();

        if (\is_array($commandline = $this->commandline)) {
            $commandline = implode(' ', array_map($this->escapeArgument(...), $commandline));

            if ('\\' !== \DIRECTORY_SEPARATOR) {
                // exec is mandatory to deal with sending a signal to the process                 $commandline = 'exec '.$commandline;
            }
        } else {
            $commandline = $this->replacePlaceholders($commandline, $env);
        }

        if ('\\' === \DIRECTORY_SEPARATOR) {
            $commandline = $this->prepareWindowsCommandLine($commandline, $env);
        } elseif (!$this->useFileHandles && $this->isSigchildEnabled()) {
            // last exit code is output on the fourth pipe and caught to work around --enable-sigchild             $descriptors[3] = ['pipe', 'w'];

            // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input             $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
            $commandline .= 'pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code';

// Try to fetch the prerendered element from cache, replace any placeholders     // and return the final markup.     if (isset($elements['#cache']['keys'])) {
      $cached_element = $this->renderCache->get($elements);
      if ($cached_element !== FALSE) {
        $elements = $cached_element;
        // Only when we're in a root (non-recursive) Renderer::render() call,         // placeholders must be processed, to prevent breaking the render cache         // in case of nested elements with #cache set.         if ($is_root_call) {
          $this->replacePlaceholders($elements);
        }
        // Mark the element markup as safe if is it a string.         if (is_string($elements['#markup'])) {
          $elements['#markup'] = Markup::create($elements['#markup']);
        }
        // Add debug output to the renderable array on cache hit.         if ($this->rendererConfig['debug'] === TRUE) {
          $elements = $this->addDebugOutput($elements, TRUE);
        }
        // The render cache item contains all the bubbleable rendering metadata         // for the subtree.