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   1  <?php
   2  
   3  /*
   4   * This file is part of JSON-API.
   5   *
   6   * (c) Toby Zerner <[email protected]>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Tobscure\JsonApi;
  13  
  14  class Util
  15  {
  16      /**
  17       * Parse relationship paths.
  18       *
  19       * Given a flat array of relationship paths like:
  20       *
  21       * ['user', 'user.employer', 'user.employer.country', 'comments']
  22       *
  23       * create a nested array of relationship paths one-level deep that can
  24       * be passed on to other serializers:
  25       *
  26       * ['user' => ['employer', 'employer.country'], 'comments' => []]
  27       *
  28       * @param array $paths
  29       *
  30       * @return array
  31       */
  32      public static function parseRelationshipPaths(array $paths)
  33      {
  34          $tree = [];
  35  
  36          foreach ($paths as $path) {
  37              list($primary, $nested) = array_pad(explode('.', $path, 2), 2, null);
  38  
  39              if (! isset($tree[$primary])) {
  40                  $tree[$primary] = [];
  41              }
  42  
  43              if ($nested) {
  44                  $tree[$primary][] = $nested;
  45              }
  46          }
  47  
  48          return $tree;
  49      }
  50  }