field_split.module

<?php

/**
 * @file
 * Main file of Field Split module.
 */

/**
 * Implements hook_help().
 */
function field_split_help($path, $arg) {
  switch ($path) {
    case 'admin/structure/field-split':
      return '<p>' . t('This is the configuration form for Field Split module. Just open the specific fieldsets, enable the split functionality and select the amount of total fields.') . '</p>';
  }
}

/**
 * Implements hook_menu().
 */
function field_split_menu() {
  $items = array();

  $items['admin/structure/field-split'] = array(
    'title' => 'Field Split',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('field_split_config_form'),
    'type' => MENU_NORMAL_ITEM,
    'access arguments' => array('administer site configuration'),
    'file' => 'field_split.admin.inc',
  );

  return $items;
}

/**
 * Implements hook_field_extra_fields().
 */
function field_split_field_extra_fields() {
  $extra = array();
  $entity_info = entity_get_info();

  // Iterate all settings and create extra fields.
  foreach ($entity_info as $entity_type => $info) {
    foreach ($info['bundles'] as $bundle => $fields) {
      $settings = variable_get('field_split_config_' . $entity_type . '__' . $bundle, array());
      foreach ($settings as $field_name => $field_settings) {
        if ($field_settings['enable']) {
          $field_info = field_info_instance($entity_type, $field_name, $bundle);
          $field_label = $field_info['label'];

          for ($i = 1; $i < $field_settings['values']; $i++) {
            $extra[$entity_type][$bundle]['display'][$field_name . '_' . $i] = array(
              'label' => $field_label . ' #' . ($i + 1),
              'weight' => $i + 20,
              'type' => 'hidden',
            );
          }
        }
      }
    }
  }

  return $extra;
}

/**
 * Implements hook_entity_view().
 */
function field_split_entity_view($entity, $type, $view_mode, $langcode) {
  list(, , $bundle) = entity_extract_ids($type, $entity);
  $field_split_settings = variable_get('field_split_config_' . $type . '__' . $bundle, array());
  $extra_fields = field_extra_fields_get_display($type, $bundle, $view_mode);

  // Iterate all fields inside the bundle.
  foreach ($field_split_settings as $field_name => $split_settings) {
    // If the main field is not available in this entity, continue,
    if (!isset($entity->{$field_name}) || (isset($entity->{$field_name}) && !count($entity->{$field_name})) || !isset($entity->content[$field_name])) {
      continue;
    }

    $enabled = $split_settings['enable'];
    $values = $split_settings['values'];

    if ($enabled) {
      for ($i = 1; $i < $values; $i++) {
        $extra_field_name = $field_name . '_' . $i;

        if (isset($extra_fields[$extra_field_name]) && isset($extra_fields[$extra_field_name]['visible']) && $extra_fields[$extra_field_name]['visible']) {
          $entity->content[$extra_field_name] = $entity->content[$field_name];

          // Remove unnecessary values from render array.
          foreach (element_children($entity->content[$extra_field_name]) as $key) {
            if ($key != $i) {
              unset($entity->content[$extra_field_name][$key]);
            }
          }

          // Move field value to '0' key.
          if ($i != 0 && isset($entity->content[$field_name][$i])) {
            $entity->content[$extra_field_name][0] = $entity->content[$field_name][$i];
            unset($entity->content[$field_name][$i]);
          }

          // Finally remove all unnecessary field values in the main field.
          foreach (element_children($entity->content[$extra_field_name]) as $key) {
            if ($key != 0) {
              unset($entity->content[$extra_field_name][$key]);
            }
          }
        }
      }
    }
  }
}