find_child_array_by_key.php

/**
 * @param array  $array
 * @param string $child
 * @return array
 */
public function find_child_array_values_by_key(array $array, string $child): array
	{
		foreach (
			new RecursiveIteratorIterator(
			new RecursiveArrayIterator($array),
			RecursiveIteratorIterator::CATCH_GET_CHILD)
			as $key => $value)
		{
			if($key !== $child && is_array($value))
			{
				$this->find_child_array_values_by_key($value, $child);
			}
			elseif($key === $child && is_array($value)) 
			{
				return $value;
			} 
      else
			{
				return [];
			}
		}
	}