如何解决 Dompdf-Laravel 2.0.0 总页码不起作用的问题？

Question

I have used this code in laravel blade file:

<script type="text/php">
    if (isset($pdf)) {
      $pdf->page_script('
        $text = "Page {PAGE_NUM} of {PAGE_COUNT}";
        $size = 12;
        $color = array(0,0,0);
        $word_space = 0.0;  //  default
        $char_space = 0.0;  //  default
        $angle = 0.0;   //  default
        $font = $fontMetrics->getFont("Verdana");
        $width = $fontMetrics->get_text_width($text, $font, $size) / 2;
        $x = ($pdf->get_width() - $width) / 2;
        $y = $pdf->get_height() - 20;
        $pdf->page_text($x, $y, $text, $font, $size, $color, $word_space, $char_space, $angle);
      ');
    }
  </script>

But Total page number always gets 1 instead of total number of pages in Laravel dompdf and only print the first page. I am using barryvdh/laravel-dompdf:v2.0.0. How can I solve this?