Issue #3215789 by sorabh.v6, andyg5000, Anybody: Allow developers to alter event data

<?php

/**

 * @file

 * API documentation for Facebook Pixel.

 */

/**

 * @addtogroup hooks

 *

 * Hooks that extend the Facebook Pixel module.

 */

/**

 * Alters the event array of data items to be pushed.

 *

 * Modules can implement hook_facebook_pixel_data_alter() to modify

 * data sent to Facebook Pixel for a specific event.

 *

 * Possible event:

 *  - Purchase

 *  - AddToCart

 *  - InitiateCheckout

 *  - CompleteRegistration

 *  - ViewContent

 *

 * @param array &$data

 *   By reference. An array of all encoded data elements.

 *

 * @param string $event

 *   Associated event id.

 */

function hook_facebook_pixel_event_data_alter(&$data, $event) {

  // Replacing product sku(currently in the data) with Product ID.

  if ($event === 'ViewContent') {

    /** @var \Drupal\commerce_product\Entity\Product $entity */

    $entity = \Drupal::request()->get('_entity');

    $data['content_ids'][0] = $entity->id();

  }

}

/**

 * @} End of "addtogroup hooks".

 */