An AfterScenario function for behat that takes and saves a screenshot

Behat AfterScenario

<?php

    /** @AfterScenario */
    public function after($event)
    {
        if($event->getResult() == Event\StepEvent::FAILED)
        {
            $imagePathPrefix  = 'http://mysite.local';
            errorImagesDir    = '/';

            $imageData = $this->getSession()->getDriver()->getScreenshot();
            $imagePath = $errorImagesDir . time() . '.png';
            file_put_contents($imagePath, $imageData);
            $imageUrl = $imagePathPrefix . $imagePath;

            $this->printDebug($imageUrl . PHP_EOL);
        }
    }