I'm using ACF to make a multilingual site. My custom post URLs must work both with and without /en/ as prefix. E.g. mysite.com/posttype/any-slug/ and mysite.com/en/posttype/any-slug/ must display the same post.

I've tried using this rewrite rule in functions.php (and some variations of it), but have trouble getting it to work:

add_action('init', 'add_my_rule');

function add_my_rule() {

I've noticed there's other questions with similar titles, but the cases seem to be different from this one.

  • Just to make sure, you know that if mysite.com/posttype/any-slug/ and mysite.com/en/posttype/any-slug/ display both the same content, you expose your site to duplicate content issue (SEO related), right? Unless you 301 redirect one to the other...
    – ClemC
    Commented Aug 21, 2017 at 20:32
  • Yes, I'm changing locale based on the URL, and using ACF to display different content. Commented Aug 21, 2017 at 20:44

1 Answer 1


pagename assumes the page post type. You need to use the custom post type query var in your rule instead. Presumably you also want to detect that this is a request for en, you can add your own rewrite tag to store that, then add that to the rule:

add_action('init', 'add_my_rule');

function add_my_rule() {
    add_rewrite_tag('%my_language%', '([^&]+)');
  • Yes, this did it! Didn't need the rewrite tag, since I detect the '/en/' in the URL and set the locale from that. Do you know if there's any benefits of setting it with the rewrite tag method? Commented Aug 22, 2017 at 7:38

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