Ticket #33885: 33885.3.diff

src/wp-admin/includes/template.php

@@ -573 +573 @@
  * Prints the form in the Custom Fields meta box.
  *
  * @since 1.2.0
+ * @since x.x.x The default list of meta keys used to populate the dropdown was removed.
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
@@ -595 +596 @@
          */
         $keys = apply_filters( 'postmeta_form_keys', null, $post );
 
-        if ( null === $keys ) {
-                /**
-                 * Filters the number of custom fields to retrieve for the drop-down
-                 * in the Custom Fields meta box.
-                 *
-                 * @since 2.1.0
-                 *
-                 * @param int $limit Number of custom fields to retrieve. Default 30.
-                 */
-                $limit = apply_filters( 'postmeta_form_limit', 30 );
-                $sql = "SELECT DISTINCT meta_key
-                        FROM $wpdb->postmeta
-                        WHERE meta_key NOT BETWEEN '_' AND '_z'
-                        HAVING meta_key NOT LIKE %s
-                        ORDER BY meta_key
-                        LIMIT %d";
-                $keys = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) );
-        }
-
         if ( $keys ) {
                 natcasesort( $keys );
                 $meta_key_input_id = 'metakeyselect';