function _field_sort_items_value_helper in Drupal 7
Same as above, using ['_weight']['#value']
Related topics
2 string references to '_field_sort_items_value_helper'
- theme_field_multiple_value_form in modules/field/ field.form.inc 
- Returns HTML for an individual form element.
- theme_file_widget_multiple in modules/file/ file.field.inc 
- Returns HTML for a group of file upload widgets.
File
- modules/field/ field.module, line 549 
- Attach custom data fields to Drupal entities.
Code
function _field_sort_items_value_helper($a, $b) {
  $a_weight = is_array($a) && isset($a['_weight']['#value']) ? $a['_weight']['#value'] : 0;
  $b_weight = is_array($b) && isset($b['_weight']['#value']) ? $b['_weight']['#value'] : 0;
  return $a_weight - $b_weight;
}