Kirby custom pages method to filter by values in structure field

filterbystructure.php

<?php
/* Usage example:
 * $filteredPages = $page('projects')->children()->visible()->filterByStructure('structureField', array(
 *  'field1' => $value,
 *  'field2' => $value
 * ));
*/ 
pages::$methods['filterByStructure'] = function($pages, $field, $options) {
  $filteredPages = $pages->filter(function($p)use($field, $options) {
    $structureField =  $p->$field()->yaml();
    foreach($structureField as $item) {
      if(!array_diff($options, $item)) return $p;
    }
  });
  return $filteredPages;
};