Creating an own markup for MultilingualPress

mlp_navigation.php

<?php

/**
 * Create a navigation between translated instances
 *
 * @param array $args {
 *		Optional. Array of nav menu arguments.
 * 
 *		@param	string	$container				Whether to wrap the language switch, and what to wrap it with. Default 'div'.
 *		@param	string	$container_class			Class that is applied to the container. Default 'language-switch'.
 *
 *		@param	string	$before					Text before the link markup. Default empty.
 *		@param	string	$after					Text after the link markup. Default empty.
 *		@param	string	$between					Separator between items. Default empty
 *
 *		@param	string	$items_wrap				How the list items should be wrapped. Default is 'ul'.
 * 		@param	string	$link_wrap				Text before the link text. Default is 'li'.
 *
 *		@param	bool		$show_current_locale	Option for shwowing the curent locale shortcut. Default true.
 * }
 * 
 * @return string
 */
function mlp_navigation( $args = array() ) {
		
	$defaults = array( 
		'container'		  =>'div',
		'container_class' =>'language-switch',

		'before'		  => '',
		'after'			  => '',
		'between'		  => '',

		'items_wrap'	   => 'nav',
		'items_wrap_class' => 'language-dropdown-list',
		
		'link_wrap'	      => '',
		
		'show_current_locale' => TRUE,
	);

	$args = wp_parse_args( $args, $defaults );
	
	$args = apply_filters( 'mlp_menu_args', $args );
	
	$args = (object) $args;


    $links = (array) mlp_get_interlinked_permalinks();

	if ( empty ( $links ) ) {
		return '';
	}

    $items = array ();
    
	$output = '<' . $args->container . ' class="' . $args->container_class  . '">';
	
	if( $args->container !== FALSE ) {
		
		$lang_code = get_locale();
		$lang_first = strtok( $lang_code, '_' );
		$lang_text  = mb_strtoupper( $lang_first );
		
		$output .= '<div class="language-dropdown-toggle">';
		$output .= '<div class="switch-label">' . $lang_text . '</div>';
		$output .= '<div class="icon-2 w-icon-dropdown-toggle"></div>';
		$output .= '</div>';
		
	}
	
	$output .= '<' . $args->items_wrap . ' class="' . $args->items_wrap_class . '">';

    foreach ( $links as $link ) {
        if ( isset ( $link['text'] ) ) {
            $text = $link['text'];
        }
        else {
            // take just the main code
            $first = strtok( $link['lang'], '_' );
            $text  = mb_strtoupper( $first );
        }
		
		if( ! empty( $args->link_wrap ) ) {
			$items[] = sprintf(
				'<' . $args->link_wrap . '>' . 
				'<a href="%1$s" hreflang="%2$s" rel="alternate">%3$s</a>' . 
				'</' . $args->link_wrap . '>',
				esc_url( $link['permalink'] ),
				esc_attr( $link['lang'] ),
				$text
			);
		} else {
			$items[] = sprintf(
				'<a href="%1$s" hreflang="%2$s" rel="alternate">%3$s</a>' . 
				'</' . $args->link_wrap . '>',
			    esc_url( $link['permalink'] ),
				esc_attr( $link['lang'] ),
				$text
			);
		}
		

    }
	
	$output .= $args->before . join( $args->between, $items ) . $args->after;
	
	if( ! empty( $args->link_wrap) ) {
		$output .= '</' . $args->items_wrap . '>';
	}
	
	$output .= '</' . $args->container . '>';
	
	return $output;
	
}