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Editing: PhpEvaluator.php

<?php
/**
 * @package dompdf
 * @link    https://github.com/dompdf/dompdf
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf;

/**
 * Executes inline PHP code during the rendering process
 *
 * @package dompdf
 */
class PhpEvaluator
{

/**
     * @var Canvas
     */
    protected $_canvas;

/**
     * PhpEvaluator constructor.
     * @param Canvas $canvas
     */
    public function __construct(Canvas $canvas)
    {
        $this->_canvas = $canvas;
    }

/**
     * @param $code
     * @param array $vars
     */
    public function evaluate($code, $vars = [])
    {
        if (!$this->_canvas->get_dompdf()->getOptions()->getIsPhpEnabled()) {
            return;
        }

// Set up some variables for the inline code
        $pdf = $this->_canvas;
        $fontMetrics = $pdf->get_dompdf()->getFontMetrics();
        $PAGE_NUM = $pdf->get_page_number();
        $PAGE_COUNT = $pdf->get_page_count();

// Override those variables if passed in
        foreach ($vars as $k => $v) {
            $$k = $v;
        }

eval($code);
    }

/**
     * @param Frame $frame
     */
    public function render(Frame $frame)
    {
        $this->evaluate($frame->get_node()->nodeValue);
    }
}

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