Ticket #23491: 23491.2.diff

src/wp-includes/rewrite.php

@@ -1892 +1892 @@
         function flush_rules($hard = true) {
                 delete_option('rewrite_rules');
                 $this->wp_rewrite_rules();
-                if ( $hard && function_exists('save_mod_rewrite_rules') )
+                if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) )
+                        return;
+                if ( function_exists( 'save_mod_rewrite_rules' ) )
                         save_mod_rewrite_rules();
-                if ( $hard && function_exists('iis7_save_url_rewrite_rules') )
+                if ( function_exists( 'iis7_save_url_rewrite_rules' ) )
                         iis7_save_url_rewrite_rules();
         }