<?php
    $url = 'http://api.sl.se/api2/realtimedepartures.json?key=xxxx&siteid=9192&timewindow=30';
    $jsondata = file_get_contents($url);

        $json = json_decode($jsondata,true);


        foreach($json['ResponseData']['Metros'] as $metro){
    if($metro['DisplayTime'] != "Nu"){
        $output .= "<ul><li><strong>".$metro['DisplayTime'].".</strong>  </li>";
    }
            else{
                $output .= "<ul><li><strong>".$metro['DisplayTime']." avgår </strong></li>";
            }
            $output .= "<li>".$metro['GroupOfLine']."</li>";
            $output .= "<li> nr ".$metro['LineNumber']."  </li>";

            $output .= "<li> till<strong> ".$metro['SafeDestinationName']."</strong></li></ul>";

        }

            echo $output;
    ?>