[wp-trac] [WordPress Trac] #57218: undefined function trailingslashit() when .maintenance present - Windows server

[WordPress Trac]

#57218: undefined function trailingslashit() when .maintenance present - Windows
server
--------------------------+-----------------------------
 Reporter:  grl570810     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  6.1
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 This is the first core bug I've ever reported so apologies if I don't
 quite follow correct protocol.

 When  if I am doing manual updates on any of the sites on my server, and
 place a .maintenance file in the site root, instead of getting the nice
 ‘under maintenance’ message they throw a 500 error like this…

 {{{
 HP Fatal error:  Uncaught Error: Call to undefined function
 trailingslashit() in D:\HTTP\WP_Sites\Recipes\wp-includes\class-wp-
 textdomain-registry.php:103
 Stack trace:
 #0 D:\HTTP\WP_Sites\Recipes\wp-includes\l10n.php(784):
 WP_Textdomain_Registry->set('default', 'en_AU', 'D:\\HTTP\\WP_Site...')
 #1 D:\HTTP\WP_Sites\Recipes\wp-includes\load.php(1401):
 load_textdomain('default', 'D:\\HTTP\\WP_Site...', 'en_AU')
 #2 D:\HTTP\WP_Sites\Recipes\wp-includes\load.php(278):
 wp_load_translations_early()
 #3 D:\HTTP\WP_Sites\Recipes\wp-settings.php(74): wp_maintenance()
 #4 D:\HTTP\WP_Sites\Recipes\wp-config.php(98):
 require_once('D:\\HTTP\\WP_Site...')
 #5 D:\HTTP\WP_Sites\Recipes\wp-load.php(50):
 require_once('D:\\HTTP\\WP_Site...')
 #6 D:\HTTP\WP_Sites\Recipes\wp-blog-header.php(13):
 require_once('D:\\HTTP\\WP_Site...')
 #7 D:\HTTP\WP_Sites\Recipes\index.php(17): require('D:\\HTTP\\WP_Site...')
 #8 {main}
 }}}

 **NB my server is a Windows machine running PHP 7.4.19 and MySQL 5.7.21.**
 I mention this as I believe it’s significant; the issue doesn’t occur if I
 put a .maintenance file onto one of the odd WP sites that I manage on a
 third party *nix server. My gut feel is that the way Windows uses \ in its
 path name rather than / in *nix is probably at the root of the issue.

 @harishanker on my original post in the support forum
 [https://wordpress.org/support/topic/undefined-function-trailingslashit-
 when-maintenance-present/] suggests that the issue arises from changeset
 54669 [https://core.trac.wordpress.org/changeset/54669/]

 I'll be happy to test any fix on my server using an RC release.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/57218>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform