# Use custom language code (URL, lang and hreflang attribute)
Here, we explain how to change the default language code. This is useful if you don't like the default 2 letters code of Weglot in the URL and want to change it into another language code.
### Example: Changing "tw" to "zh-HK"
In this post, we show for example how to change language code tw (Traditional Chinese) to zh-HK (Hong Kong Chinese).
```markup
```
### Hook for customize language code
This hook must be load before your theme. This is why you can not use it in your `functions.php`. To use it, you can follow one of the 2 method below.
```php
// Use zh-HK (Hong Kong Chinese) instead tw (Traditional Chinese)
add_filter( 'weglot_language_code_replace', 'custom_weglot_language_code_replace' );
function custom_weglot_language_code_replace( $replacements ) {
$replacements['tw'] = 'zh-HK';
return $replacements;
}
// Use tw instead of zh-HK on hreflangs (optional)
add_filter( 'weglot_href_lang', 'custom_weglot_href_lang' );
function custom_weglot_href_lang( $render ) {
$render = str_replace("hreflang=\"zh-HK\"", "hreflang=\"tw\"", $render);
return $render;
}
```
### Update for autoredirection option
If you've activate the autoredirection option, you should be use this other filter to add your custom code into the navigator language list
```
add_filter( 'weglot_navigator_language', 'custom_weglot_navigator_language' );
function custom_weglot_navigator_language( $navigator_languages ) {
$navigator_languages = array();
if ( isset( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) { //phpcs:ignore
$navigator_languages = explode( ',', trim( sanitize_text_field( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) );
foreach ( $navigator_languages as &$navigator_language ) {
if ( strpos( $navigator_language, ';' ) !== false ) {
$navigator_language = substr( $navigator_language, 0, strpos( $navigator_language, ';' ) );
}
$navigator_language = strtolower( $navigator_language );
$navigator_language = str_replace('tw', 'zh-HK', $navigator_language);
}
}
return $navigator_languages;
}
```
### Method 1: Use plugin Code Snippets
1. Add and activate Code Snippets plugin on your WordPress:
2. In your WordPress back office, go to Snippets -> Add new
3. Add a title (example: `Weglot - Custom language code`)
4. Add the following code into the code input. Don't copy `
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.