A class for detecting when the plugin has updated (WordPress)

dxw-security.php

<?php

// ...

register_activation_hook( __FILE__, array( "dxw_security_Update_Checker", 'record_version' ));

if (dxw_security_Update_Checker::updated() ) {
  dxw_security_Cron::schedule_tasks();
  dxw_security_Update_Checker::record_version();
}

// ...

?>

update_checker.class.php

<?php

defined('ABSPATH') OR exit;

class dxw_security_Update_Checker {
  private static $version_key = "dxw_security_plugin_version";

  public static function updated() {
    return self::previous_version() != self::current_version();
  }

  public static function record_version() {
    update_option(self::$version_key, self::current_version());
  }

  private static function previous_version() {
    return get_site_option(self::$version_key);
  }

  private static function current_version() {
    // TODO: is this OK or should we use get_plugin_data?
    return DXW_SECURITY_PLUGIN_VERSION;
  }
}
?>