function wistia_wordpress_update_anti_mangler_default()
{
    // This is required for `is_plugin_active`.
    include_once ABSPATH . 'wp-admin/includes/plugin.php';
    // If wistia_wordpress_anti_mangler isn't defined on upgrade/install, let's
    // define it. If you're upgrading from an older version where the option
    // didn't exist, default it to ON so nothing changes. New installs, however,
    // should default to OFF.
    $wistia_wordpress_anti_mangler = get_wistia_wordpress_option('anti_mangler');
    $plugin_already_activated = is_plugin_active(wistia_wordpress_plugin_file());
    if (empty($wistia_wordpress_anti_mangler)) {
        if ($plugin_already_activated) {
            set_wistia_wordpress_option('anti_mangler', 'on');
        } else {
            set_wistia_wordpress_option('anti_mangler', 'off');
        }
    }
    // Record version in database for future upgrade path pivoting.
    $current_plugin_data = get_plugin_data(wistia_wordpress_plugin_file());
    $current_wistia_wordpress_version = $current_plugin_data['Version'];
    set_wistia_wordpress_option('version', $current_wistia_wordpress_version);
}
 value='off'>
    Off
  </label>
  <?php 
}
function wistia_wordpress_settings_section_callback()
{
    echo __('<p>The Wistia WordPress plugin enables oEmbeds to work in WordPress.</p> <p>There is also some legacy functionality which allows raw HTML, which we recommend turning OFF. It\'s better to use oEmbed!</p>', 'wordpress');
}
function wistia_wordpress_options_page()
{
    ?>
  <form action='options.php' method='post'>
    <h2>Wistia WordPress</h2>
    <?php 
    settings_fields('pluginPage');
    do_settings_sections('pluginPage');
    submit_button();
    ?>
  </form>
  <?php 
}
// Link to Settings page from the Plugins page next to Deactivate | Edit.
$plugin = plugin_basename(wistia_wordpress_plugin_file());
function wistia_wordpress_add_settings_link($links)
{
    $settings_link = '<a href="options-general.php?page=wistia_wordpress">' . __('Settings') . '</a>';
    array_push($links, $settings_link);
    return $links;
}
add_filter("plugin_action_links_{$plugin}", 'wistia_wordpress_add_settings_link');