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<?php

/**

 * @file

 * Hooks provided by the Product Reference module.

 */

/**

 * Allows modules to alter the delta value used to determine the default product

 * entity in an array of referenced products.

 *

 * The basic behavior for determining a default product from an array of

 * referenced products is to use the first referenced product. This hook allows

 * modules to change that to a different delta value.

 *

 * Note that in some cases $products will be keyed by product ID while in other

 * cases it will be 0 indexed.

 *

 * @param $delta

 *   The key in the $products array of the product that should be the default

 *   product for display purposes in a product reference field value array.

 * @param $products

 *   An array of product entities referenced by a product reference field.

 *

 * @see commerce_product_reference_default_product()

 */

function hook_commerce_product_reference_default_delta_alter(&$delta, $products) {

  // If a product with the SKU PROD-01 exists in the array, set that as the

  // default regardless of its position.

  foreach ($products as $key => $product) {

    if ($product->sku == 'PROD-01') {

      $delta = $key;

    }

  }

}