Ticket #39067: 39067.patch

wp-includes/user.php

@@ -1525 +1535 @@
         ) {
                 return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) );
         }
+        
+        /**
+         * Filters for any custom validation.
+         *
+         * @since 4.7.1
+         *
+         * @param true|WP_Error true on success, and WP_Error if error.
+         * @param array $userdata Array of userdata.
+         */
+        $pre_user_validate = apply_filters( 'pre_user_validate', true, $userdata );
+
+        if ( is_wp_error( $pre_user_validate ) ) {
+                return $pre_user_validate;
+        }
+        
         $nickname = empty( $userdata['nickname'] ) ? $user_login : $userdata['nickname'];
 
         /**