Wordpress Snippet

Set different language for some WordPress posts

You might need to change the default language for some of your posts written in another language. Assuming you have a blog category designated for this different language, you could use the following snippet:

// Add a filter to modify the language attributes
add_filter('language_attributes', function($lang) {
    // Check if the current page is a single post page
    if(is_single()) {
        // Retrieve the categories of the post
        $categories = get_the_category();
        // Loop through each category
        foreach($categories as $category) {
            // Check if the category slug matches 'czech-articles'
            if($category->slug == 'czech-articles') {
                // If a match is found, replace 'en-GB' with 'cs' in the language attributes
                $lang = str_replace('en-GB', 'cs', $lang);
                // Break the loop as we found the category we were looking for
    // Return the modified (or unmodified) language attributes
    return $lang;