Behat Selenium driver screenshot

FeatureContext.php

<?php

  /**
   * @AfterStep
   */
  public function takeScreenShotAfterFailedStep(AfterStepScope $scope) {
    if (99 === $scope->getTestResult()->getResultCode()) {
      $driver = $this->getSession()->getDriver();
      if (!($driver instanceof Selenium2Driver)) {
        return;
      }
      file_put_contents('/path/to/screenshots/filename.png', $this->getSession()->getDriver()->getScreenshot());
    }
  }