materio-base-d7/sites/all/modules/contrib/social/social_media_links/social_media_links.install

<?php

/**
 * @file
 * Social Media Link module's install and uninstall code.
 */

/**
 * Implements hook_uninstall().
 */
function social_media_links_uninstall() {
  variable_del('social_media_links_platforms');
  variable_del('social_media_links_appearance');
  variable_del('social_media_links_link_attributes');
  variable_del('social_media_links_icon_style');
}

/**
 * Migrate the platform data to the new structure.
 */
function social_media_links_update_7101() {
  $platforms = variable_get('social_media_links_platforms', array());
  foreach ($platforms as $key => $value) {
    if (!is_array($value)) {
      $platform_new = array(
        'platform_value' => $value,
        'weight' => 0,
      );
      $platforms[$key] = $platform_new;
    }
  }
  variable_set('social_media_links_platforms', $platforms);
}