class PhpProcess

PhpProcessTest.php in drupal/core/vendor/symfony/process/Symfony/Component/Process/Tests/PhpProcessTest.php

class PhpProcess extends Process {
  private $executableFinder;

  /**
   * Constructor.
   *
   * @param string  $script  The PHP script to run (as a string)
   * @param string  $cwd     The working directory
   * @param array   $env     The environment variables
   * @param integer $timeout The timeout in seconds
   * @param array   $options An array of options for proc_open
   *
   * @api
   */
  public function __construct($script, $cwd = null, array $env = array(), $timeout = 60, array $options = array()) {
    parent::__construct(null, $cwd, $env, $script, $timeout, $options);
    $this->executableFinder = new PhpExecutableFinder();
  }

  /**
   * Sets the path to the PHP binary to use.
   *
   * @api
   */
  public function setPhpBinary($php) {
    $this
      ->setCommandLine($php);
  }

  /**
   * {@inheritdoc}
   */
  public function start($callback = null) {
    if (null === $this
      ->getCommandLine()) {
      if (false === ($php = $this->executableFinder
        ->find())) {
        throw new RuntimeException('Unable to find the PHP executable.');
      }
      $this
        ->setCommandLine($php);
    }
    parent::start($callback);
  }

}