Setting WordPress language programmatically?

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I have a user based website with WordPress and from their profile settings they are able to select the language, this info and other settings are set for every user in user_meta.

I know how to translate but, is there a way to set the theme language programmatically?

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Thank you!

Edit: No plugins please, I need to do this as simple as possible.

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8 comments

  2. I found a different solution: 

    // Set user selected language by loading the lang.mo file
if ( is_user_logged_in() ) {

    // add local filter
    add_filter('locale', 'language');

    function language($locale) {
        /* Note: user_meta and user_info are two functions made by me,
           user_info will grab the current user ID and use it for
           grabbing user_meta */

        // grab user_meta "lang" value
        $lang = user_meta(user_info('ID', false), 'lang', false); 

        // if user_meta lang is not empty
        if ( !empty($lang) ) {
           $locale = $lang; /* set locale to lang */
        }

        return $locale; 
    }

    // load textdomain and .mo file if "lang" is set
    load_theme_textdomain('theme-domain', TEMPLATEPATH . '/lang');

}

    Via: http://codex.wordpress.org/Function_Reference/load_theme_textdomain

  3. I came up with following solution as I needed to generate invoices from a plugin in different languages in the scope of the same request:

        global $locale;

    $locale = 'en_CA';
    load_plugin_textdomain('invoice', false, 'my-plugin/languages/');
    generateInvoice(); // produce the English localized invoice

    $locale = 'fr_CA';
    load_plugin_textdomain('invoice', false, 'my-plugin/languages/');
    generateInvoice(); // produce the French localized invoice

  4. I guess you’re looking for the override_load_textdomain filter, called just in the beginning of a load_textdomain function call.

    That would be something like:

    function my_load_textdomain ($retval, $domain, $mofile) {

    if ($domain != 'theme_domain')
        return false;

    $user = get_currentuserinfo()
    $user_lang = get_user_lang($user);

    if ($new_mofile = get_my_mofile($user_lang)) {
        load_textdomain('theme_domain', $new_mofile);
        return true;
    }

    return false;
}
add_filter('override_load_textdomain', 'my_load_textdomain');

    Code from brain to keyboard, not tested. You should do some more validations and so.

  6. A had same question, I resolved it this way:

    fist step you have to create a .mo with a text domain. You can use loco translate plugin: https://br.wordpress.org/plugins/loco-translate/

    Load your text domain linking .mo file:

    load_textdomain('your_text_domain', '/your/file.mo');

    Change wordpress location via hook. Create a function wich returns wanted location. Use WordPress Locale Id ever, you can see all locales Id here: https://wpastra.com/docs/complete-list-wordpress-locale-codes/

    Lets write the function:

    function wpsx_redefine_locale($locale){
  
  return 'ja';
}
add_filter('locale','wpsx_redefine_locale',10);

    You can change by user location. This way wordpress sets the same language was be set by user in its control panel:

    $user_locale = get_user_locale();
function wpsx_redefine_locale($locale){
  global $user_locale;
  return $user_locale;
}
add_filter('locale','wpsx_redefine_locale',10);

    Obs: My wordpress version is 5.7. This way can no work in another versions. Good look!

  7. I had a similar problem and solved it like this:

    1. In my case I wanted to retrieve the locale by using the user locale: $userLocale = get_user_locale($userObject->ID);

    2. I created a custom function to load the correct theme_textdomain with dynamic locale. It’s almost the same as the WP function, but you can add a locale variable: 

      /**
 * Loads text domain by custom locale
 * Based on a WP function, only change is the custom $locale
 * parameter so we can get translated strings on demand during runtime
 */
function load_theme_textdomain_custom_locale($domain, $path = false, $locale)
{
    /**
     * Filter a theme's locale.
     *
     * @since 3.0.0
     *
     * @param string $locale The theme's current locale.
     * @param string $domain Text domain. Unique identifier for retrieving translated strings.
     */
    $locale = apply_filters('theme_locale', $locale, $domain);

    if (!$path) {
        $path = get_template_directory();
    }

    // Load the textdomain according to the theme
    $mofile = "{$path}/{$locale}.mo";
    if ($loaded = load_textdomain($domain, $mofile)) {
        return $loaded;
    }

    // Otherwise, load from the languages directory
    $mofile = WP_LANG_DIR . "/themes/{$domain}-{$locale}.mo";
    return load_textdomain($domain, $mofile);
}

    Based on:
    http://queryposts.com/function/load_theme_textdomain/