Ticket #43271: 43271.2.diff

src/wp-includes/taxonomy.php

@@ -2312 +2312 @@
          * and term_taxonomy_id of the older term instead. Then return out of the function so that the "create" hooks
          * are not fired.
          */
-        $duplicate_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.term_id, tt.term_taxonomy_id FROM $wpdb->terms t INNER JOIN $wpdb->term_taxonomy tt ON ( tt.term_id = t.term_id ) WHERE t.slug = %s AND tt.parent = %d AND tt.taxonomy = %s AND t.term_id < %d AND tt.term_taxonomy_id != %d", $slug, $parent, $taxonomy, $term_id, $tt_id ) );
+        $duplicate_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.term_id, t.slug, tt.term_taxonomy_id, tt.taxonomy FROM $wpdb->terms t INNER JOIN $wpdb->term_taxonomy tt ON ( tt.term_id = t.term_id ) WHERE t.slug = %s AND tt.parent = %d AND tt.taxonomy = %s AND t.term_id < %d AND tt.term_taxonomy_id != %d", $slug, $parent, $taxonomy, $term_id, $tt_id ) );
+
+        /**
+         * Filters the duplicate term check that takes place during term creation.
+         *
+         * Term parent+taxonomy+slug combinations are meant to be unique, and wp_insert_term()
+         * performs a last-minute confirmation of this uniqueness before allowing a new term
+         * to be created. Plugins with different uniqueness requirements may use this filter
+         * to bypass or modify the duplicate-term check.
+         *
+         * @since 5.0.0
+         *
+         * @param object $duplicate_term Duplicate term row from terms table, if found.
+         * @param string $term           Term being inserted.
+         * @param string $taxonomy       Taxonomy name.
+         * @param array  $args           Term arguments passed to the function.
+         * @param int    $tt_id          term_taxonomy_id for the newly created term.
+         */
+        $duplicate_term = apply_filters( 'wp_insert_term_duplicate_term_check', $duplicate_term, $term, $taxonomy, $args, $tt_id );
+
         if ( $duplicate_term ) {
                 $wpdb->delete( $wpdb->terms, array( 'term_id' => $term_id ) );
                 $wpdb->delete( $wpdb->term_taxonomy, array( 'term_taxonomy_id' => $tt_id ) );