title: Adding post meta by URL in wp-admin
body: <p>I have a script that order Wordpress posts by <code>custom field</code> and I would like to have a link that add's a custom field by clicking on it.</p>
  
  <p><strong>Like this (or so):</strong> <code>&lt;a href="/wp-admin/post.php?action=add_post_meta&amp;my_meta_key&amp;my_meta_value&amp;post=1500&amp;_wpnonce=...</code></p>
  
  <p><strong>My script uses:</strong></p>
  
  <pre><code>$path = preg_replace('/wp-content.*$/','',__DIR__);
  include($path.'wp-load.php');
  global $wpdb;
  </code></pre>
  
  <p>Is this possble?</p>