title: plugin activation hook not working in wordpress
body: <p>I'm trying to develop my first Wordpress plugin and I got staled in the very first stage. I'm trying to setup some options and database tables when the plugin is activated, but no luck. No matter what I do, the plugin activates, but the database is untouched and the options are not stored in DB. I tried echoing inside the constructor, but it seems that it never reaches it. I have debug activated in WP, but no error is being reported. The function is not being hooked. Does someone can spot what's wrong with my code?</p>
  
  <p>Thanks for any help in advance.</p>
  
  <pre><code>class Myplugin {
  
      private static $instance;
  
      public static function get_instance() {
          if ( ! self::$instance ) {
              self::$instance = new self();
          }
          return self::$instance;
      }
  
      private function __construct() {
          register_activation_hook( __FILE__, array( &amp;$this, 'plugin_activate' ) );
      }
  
      public function plugin_activate() {
          if ( version_compare( get_bloginfo( 'version' ), '3.8.2', ' &lt; ' ) ) {
              deactivate_plugins( basename( __FILE__ ) );
          } else {
              $rlm_rsvplus_options = array(
                  'db_version'          =&gt; '1.0',
                  'event_name'          =&gt; '',
                  'end_date'            =&gt; '',
              );
  
          update_option( 'rlm_myplugin_options', $rlm_myplugin_options );
  
          require_once( "includes/rlm_myplugin_db_setup.php" );//It never reaches this file.
  
  
      }
      }
  }
  
  $myplugin = Myplugin::get_instance();
  </code></pre>