widget form method in wordpress -


i need help.

i have code 

<?php  class messenger extends wp_widget {   function messenger()   {     $widget_ops = array('classname' => 'messenger', 'description' => 'displays messages users' );     $this->wp_widget('messenger', 'messenger', $widget_ops);   }   public function form($instance)   {     extract($instance);      ?>     title         <input class="widefat"                id="<?php echo $this->get_field_id('title') ?>"             name="<?php echo $this->get_field_name('title')?>"                                                 value="<?php  if(isset($title)) echo $title;  ?>"         />     <?php   }    public function update()   {   }    public function widget()   {   }  } add_action( 'widgets_init', function(){return register_widget("messenger");});?>

but unfortunately error occurred warning: extract() expects parameter 1 array, null given in c:\wamp\www\pt\wp-content\plugins\messenger\messenger.php on line 22 not know why, not know why $instance keep null after submit form.


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