PDF version converter using Ghoshscript

Pdf_version_converter.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

use Symfony\Component\Process\Exception\ProcessFailedException;
use Symfony\Component\Process\Process;

class Pdf_version_converter
{
  private $gsPath;
  private $baseCommand = '%s -sDEVICE=pdfwrite -dCompatibilityLevel=%s -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=%s %s';

  public function __construct()
  {
    $this->gsPath = getenv('GHOSTSCRIPT_PATH') ?: 'gs';
  }

  public function run($originalFile, $newFile, $newVersion)
  {
    $command = sprintf($this->baseCommand, $this->gsPath, $newVersion, escapeshellarg($newFile), escapeshellarg($originalFile));

    $process = new Process($command);
    $process->run();

    if (!$process->isSuccessful()) {
      throw new ProcessFailedException($process);
    }
  }
}