<?php 
global $wpdb;
$table_prefix = $wpdb->prefix; 
$query = $wpdb->prepare("SELECT SUM(meta_value) AS total_views FROM {$table_prefix}postmeta WHERE meta_key = 'my_post_viewed'" ); 
$total_views = $wpdb->get_var($query); 
echo 'Görüntülenme Sayısı: ' . intval($total_views); 
?>