signup_get_available_languages(): string[]

904function signup_get_available_languages() {905	/**906	 * Filters the list of available languages for front-end site sign-ups.907	 *908	 * Passing an empty array to this hook will disable output of the setting on the909	 * sign-up form, and the default language will be used when creating the site.910	 *911	 * Languages not already installed will be stripped.912	 *913	 * @since 4.4.0914	 *915	 * @param string[] $languages Array of available language codes. Language codes are formed by916	 *                            stripping the .mo extension from the language file names.917	 */918	$languages = (array) apply_filters( 'signup_get_available_languages', get_available_languages() );919 920	/*921	 * Strip any non-installed languages and return.922	 *923	 * Re-call get_available_languages() here in case a language pack was installed924	 * in a callback hooked to the 'signup_get_available_languages' filter before this point.925	 */926	return array_intersect_assoc( $languages, get_available_languages() );927}