Ticket #10619: wordpress_import_meta_serialized.patch

wp-admin/import/wordpress.php

@@ -551 +551 @@
                 // the filter can return false to skip a particular metadata key
                 $_key = apply_filters('import_post_meta_key', $key);
                 if ( $_key ) {
-                        add_post_meta( $post_id, $_key, $value );
+                  add_post_meta( $post_id, $_key, $value, false, false );
                         do_action('import_post_meta', $post_id, $_key, $value);
                 }
         }

wp-includes/post.php

@@ -510 +510 @@
  * @param bool $unique Optional, default is false. Whether the same key should not be added.
  * @return bool False for failure. True for success.
  */
-function add_post_meta($post_id, $meta_key, $meta_value, $unique = false) {
+function add_post_meta($post_id, $meta_key, $meta_value, $unique = false, $serialize = true) {
         if ( !$meta_key )
                 return false;
 
@@ -526 +526 @@
         if ( $unique && $wpdb->get_var( $wpdb->prepare( "SELECT meta_key FROM $wpdb->postmeta WHERE meta_key = %s AND post_id = %d", $meta_key, $post_id ) ) )
                 return false;
 
-        $meta_value = maybe_serialize( stripslashes_deep($meta_value) );
+        $meta_value = stripslashes_deep($meta_value);
+        if ($serialize) $meta_value = maybe_serialize($meta_value);
 
         $wpdb->insert( $wpdb->postmeta, compact( 'post_id', 'meta_key', 'meta_value' ) );