Polylang get non-current language/s

You need to use the function pll_the_languages() to get the language switcher.

It has a bunch of arguments which you can use to customise the language switcher:

$args is an optional array parameter. Options are:

‘dropdown’ => displays a list if set to 0, a dropdown list if set to 1 (default: 0)
‘show_names’ => displays language names if set to 1 (default: 1)
‘display_names_as’ => either ‘name’ or ‘slug’ (default: ‘name’)
‘show_flags’ => displays flags if set to 1 (default: 0)
‘hide_if_empty’ => hides languages with no posts (or pages) if set to 1 (default: 1)
‘force_home’ => forces link to homepage if set to 1 (default: 0)
‘echo’ => echoes if set to 1, returns a string if set to 0 (default: 1)
‘hide_if_no_translation’ => hides the language if no translation exists if set to 1 (default: 0)
‘hide_current’=> hides the current language if set to 1 (default: 0)
‘post_id’ => if set, displays links to translations of the post (or page) defined by post_id (default: null)
‘raw’ => use this to create your own custom language switcher (default:0)

The function reference for Polylang is available here: https://polylang.wordpress.com/documentation/documentation-for-developers/functions-reference/

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