vacation-list.php

                        <h3>Ferien im Monat <?php echo strftime ('%B' , get_post_meta($post_id , 'Date', true ) ) ?></h3>
                        <?php
                            $i = 0;
                            $nextPeriod = false;

                            foreach ($days as $day) {
                                $vacationDataJson = get_post_meta($day->ID, 'Ferien', true );

                                ### Ist dies ein Ferientag? ###
                                if( strlen($vacationDataJson) > 0 ) {
                                    $i++;
                                    $vacationData  = json_decode ( $vacationDataJson);

                                    ### damit die Liste nur beim ersten Durchlauf geoeffnet wird ###
                                    if ($i == 1) {
                                        print "<ul>";
                                    }

                                    ### ersten Ferientag speichern
                                    if ($i == 1 || $nextPeriod == true ){

                                        $firstVacationDate = date ('d.m.' , strtotime( get_post_meta($day->ID, 'Date', true ) ) );
                                        $firstVacationType = $vacationData->FERIENART;

                                    } else {

                                        $currentVacationType = $vacationData->FERIENART;

                                        if($currentVacationType == $firstVacationType){

                                            $lastVacationDayDate = date ('d.m.' , strtotime( get_post_meta($day->ID, 'Date', true ) ) );

                                        } elseif($currentVacationType != $firstVacationType){

                                            $nextPeriod = true;
                                            print  "<li>" . $firstVacationDate . " bis "  . $lastVacationDayDate . " - " . $firstVacationType . "</li>" ;

                                        }
                                    }

                                    ### Liste schliessen ###
                                    print "</ul>";
                                }
                            }
                        ?>