Weglot Translation Shortcode

functions.php

function translate_shortcode( $atts = [], $content = null, $tag = ''  ) {
	// Get current URI and set cache timeout
	$current_url = $_SERVER["REQUEST_URI"];
	$cache_timeout = 86400;
	
	// normalize attribute keys, lowercase
	$atts = array_change_key_case( (array) $atts, CASE_LOWER );

	// override default attributes with user attributes
	$custom_atts = shortcode_atts(
		array(
			'lang' => 'en',
			'label' => 'English',
		), $atts
	);
	
	$o = null;
	
	// Get URL from cache if possible
	if ( false === ( $o = get_transient( get_the_guid() . '__' . $custom_atts['lang'] ) ) ) {
		$language_services = weglot_get_service( 'Language_Service_Weglot' );
		$request_url_services = weglot_get_service( 'Request_Url_Service_Weglot' );

		if ( ! is_null($language_services) && ! is_null($request_url_services) ) {
			//create url object
			$wg_url = $request_url_services->create_url_object( $current_url );

			// get a language
			$language = $language_services->get_language_from_internal($custom_atts['lang']);

			//display url for language
			$translated_url = $wg_url->getForLanguage( $language );

			if ( ! is_null($translated_url) ) {
				$o = '<a href="' . $translated_url . '" class="lang-link" data-wg-notranslate>' . $custom_atts['label'] . '</a>';

				set_transient(get_the_guid() . '__' . $custom_atts['lang'], $o, $cache_timeout);
			} 
		}
	}
	
	// return output
	return $o;
}

function translate_shortcode_init() {
	add_shortcode( 'translate', 'translate_shortcode' );
}

add_action( 'init', 'translate_shortcode_init' );