wordpress怎么添加文章阅读数量

//取得文章的阅读次数  
  function post_views($before = '点击 ', $after = ' 次', $echo = 1)  
  {  
    global $post;  
    $post_ID = $post->ID;  
    $views = (int)get_post_meta($post_ID, 'views', true);  
    if ($echo) echo $before, number_format($views), $after;  
    else return $views;  
  }  
 function record_visitors()  
 {  
     if (is_singular()) {  
       global $post;  
       $post_ID = $post->ID;  
       if($post_ID) {  
           $post_views = (int)get_post_meta($post_ID, 'views', true);  
           if(!update_post_meta($post_ID, 'views', ($post_views+1))) {  
             add_post_meta($post_ID, 'views', 1, true);  
          }  
       }  
     }  
}  
 add_action('wp_head', 'record_visitors');

<?php post_views(); ?>