Utils.php

<?php

class Utils
{
  private function __construct ()
  {
  }

  /**
   * @param array $array
   * @return array
   * Note : Recursively filters out empty values and arrays at any depth.
   */
  public static function recursiveArrayFilter (array $array): array
  {
    return array_filter($array, function ($item) {
        if (is_array($item)) {
            $item = self::recursiveArrayFilter($item);
        }
        return !empty($item);
    });
  }

  /**
   * Find matching keys between 2 lists.
   *
   * @param array|null $elements
   * @param array $keys
   * @return array
   */
  public static function findMatchingKeys (?array $elements, array $keys): array
  {
    $matching = [];

    foreach ($elements as $element) {
      foreach ($keys as $key) {
        if (!empty($element) && array_key_exists($key, $element)) {
          $matching[] = $key;
        }
      }
    }

    return $matching;
  }

  /**
   * @param $array
   * @return array
   * Note : simply return all values of a multi-dimensional array.
   */
  public static function getArrayValuesRecursive ($array)
  {
    $values = [];
    foreach ($array as $value) {
      if (is_array($value)) {
        // If value is an array, merge its values recursively
        $values = array_merge($values, self::getArrayValuesRecursive($value));
      } else {
        // If value is not an array, add it to the result
        $values[] = $value;
      }
    }
    return $values;
  }

  /**
   * @param string $text
   * @return string
   * Note : This come from jwtToken, as it is completely private - it is cloned here for now.
   */