<?php

namespace LakeDrops\Docker4Drupal;

/**
 * Class NestedArray.
 *
 * @package LakeDrops\Docker4Drupal
 */
class NestedArray {

  /**
   * Deeply merges arrays. Borrowed from drupal.org/project/core.
   *
   * @return array
   *   The merged array.
   */
  public static function mergeDeep(): array {
    return self::mergeDeepArray(func_get_args());
  }

  /**
   * Deeply merges arrays. Borrowed from drupal.org/project/core.
   *
   * @param array $arrays
   *   An array of array that will be merged.
   * @param bool $preserve_integer_keys
   *   Whether to preserve integer keys.
   *
   * @return array
   *   The merged array.
   */
  public static function mergeDeepArray(array $arrays, $preserve_integer_keys = FALSE): array {
    $result = [];
    foreach ($arrays as $array) {
      foreach ($array as $key => $value) {
        if (is_int($key) && !$preserve_integer_keys) {
          $result[] = $value;
        }
        /** @noinspection NotOptimalIfConditionsInspection */
        elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) {
          $result[$key] = self::mergeDeepArray([$result[$key], $value], $preserve_integer_keys);
        }
        else {
          $result[$key] = $value;
        }
      }
    }
    return $result;
  }

}