/**
  * This function is used to delete a post type link by the post type link ID.
  * Note that this will also delete all created links between posts using this post type link.
  *
  * @since  1.0.0
  * @access public
  *
  * @param $ptl_id
  *
  * @return bool
  */
 public function delete_post_type_link($ptl_id)
 {
     $post_type_link_manager = new SP_Connection_Manager();
     return $post_type_link_manager->delete($ptl_id);
 }
 /**
  * AJAX method to delete link
  *
  * @access public
  * @return void
  */
 public function ajax_delete_link()
 {
     // Check if user is allowed to do this
     if (!current_user_can('manage_options')) {
         return;
     }
     // Check nonce
     if (!isset($_POST['nonce']) || !wp_verify_nonce($_POST['nonce'], plugin_basename(__FILE__))) {
         return;
     }
     // Delete PT link
     $pt_type_manager = new SP_Connection_Manager();
     $pt_type_manager->delete($_POST['id']);
     // Generate JSON response
     $response = json_encode(array('success' => true));
     header('Content-Type: application/json');
     echo $response;
     // Bye
     exit;
 }