Get active languages in WPML, It's used in a plugin called "WooCommerce Checkout Advanced Fields and Templates"

get-languages.php

<?php 

/**
	* Get active languages in WPML 
	* @return array
	* @since    1.0
	*/
	public static function wct_get_languages(){
		$languages_arr = array();
		$wct_wpml = get_option('wct_wpml');
		include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
		if (is_plugin_active( 'sitepress-multilingual-cms/sitepress.php' ) ) {
			$languages = icl_get_languages('skip_missing=0&orderby=code');
			if($languages){
				foreach($languages as $l){
					$languages_arr[] = array('active'=> $l['active'], 'default_locale' => $l['language_code'], 'translated_name' => $l['translated_name'], 'country_flag_url' => $l['country_flag_url']);
				}    
			}
		}

		return $languages_arr;
		var_dump($languages_arr);die;
	}
	
		* Get active languages in WPML - Second Method - got it from WPML core 
 	* @return array
	* @since    1.0
	*/
	
	
	global $sitepress; 
	$list_lang = $sitepress->get_active_languages();
	
?>

This is the snippet to get "active" languages in WPML, you can more information about that active languages by include more fields into the $language_arr . Available information can be added to array:

id: Internal reference id
active: This is the currently active language (exactly one language is active)
native_name: The native name of the language (never translated)
translated_name: The name of the language translated to the currently active language
country_flag_url: The URL to a PNG image with the country flag
url: The link to the translation in that language
missing: 1 if the translation for that element is missing, 0 if it it exists.