Ticket #21606: taxonomy.php.patch

wp-includes/taxonomy.php

@@ -1461 +1461 @@
  * @param int|string $term The term to check
  * @param string $taxonomy The taxonomy name to use
  * @param int $parent ID of parent term under which to confine the exists search.
- * @return mixed Returns 0 if the term does not exist. Returns the term ID if no taxonomy is specified
+ * @return mixed Returns null if the term does not exist. Returns the term ID if no taxonomy is specified
  *      and the term ID exists. Returns an array of the term ID and the taxonomy if the pairing exists.
  */
 function term_exists($term, $taxonomy = '', $parent = 0) {
@@ -1472 +1472 @@
 
         if ( is_int($term) ) {
                 if ( 0 == $term )
-                        return 0;
+                        return null;
                 $where = 't.term_id = %d';
                 if ( !empty($taxonomy) )
                         return $wpdb->get_row( $wpdb->prepare( $tax_select . $where . " AND tt.taxonomy = %s", $term, $taxonomy ), ARRAY_A );
@@ -1483 +1483 @@
         $term = trim( stripslashes( $term ) );
 
         if ( '' === $slug = sanitize_title($term) )
-                return 0;
+                return null;
 
         $where = 't.slug = %s';
         $else_where = 't.name = %s';