WordPress multi-language site (As SSO Provider) with use locale Discourse instances

Product Support WordPress
5

Yes, that is the correct filter. For updating the locale of users who already exist on your system, you also need to pass the locale_force_update parameter. This code example will update a user’s locale to ‘fr’:

add_filter( 'wpdc_sso_params', 'wpdc_custom_sso_params' );
function wpdc_custom_sso_params( $params) {
    $params['locale_force_update'] = 'true';
	$params['locale'] = 'fr';

	return $params;
}

The WordPress get_locale() function is going to be unreliable to use for this. On my site that function returns "en_CA". Discourse doesn’t accept this as a valid locale. It wants the string "en".

Here’s the full list of locales that Discourse will accept:

ar, bg, bs_BA, ca, cs, da, de, el, en, es, et, fa_IR, fi, fr, gl, he, hu, id, it, ja, ko, lt, lv, nb_NO, nl, pl_PL, pt, pt_BR, ro, ru, sk, sl, sq, sr, sv, sw, te, th, tr_TR, uk, ur, vi, zh_CN, zh_TW

I think what you want is a URL in this form:

<a href="https://forum.example.com/session/sso?return_path=https://forum.example.com/your-discourse-endpoint">Link Text</a>

The user will be taken to the URL set in the return_path parameter. Let me know if that isn’t what you are looking for.