Create a simple CSS bar graph in View (for visits in the past 14 days)

XHTML <span> Graph

<?php for ($i=14;$i>0;$i--) : ?>
  <span class="graph">
    <?php
      $date = new DateTime();
      $date->sub(new DateInterval("P".$i."D"));
      $start = new DateTime($date->format('Y-m-d 00:00:00'));                  
      $end = new DateTime($date->format('Y-m-d 23:59:59'));
      $y = $visitLocation->getVisitsInRange($start, $end);
      
      $nextday = new DateTime($date->format('Y-m-d 00:00:00'));
      $nextday->add(new DateInterval("P1D"));
      
      if ($y != 0) {
        $percent = round($y/25*100, 2);
      } else {
        $percent = 0;
      }
      if ($percent > 100) {
        $percent = 100;
      }
    ?>
  <a href="<?php echo url_for('visit/filter').'?visit_filters[location_id]='.$visitLocation->getId().'&visit_filters[arrival_date][from]='.$start->format('Y-m-d').'&visit_filters[arrival_date][to]='.$nextday->format('Y-m-d'); ?>" class="fill" style="height: <?php echo $percent; ?>%;" title="<?php echo $y ?> visits <?php echo $start->format('l, M j'); ?>"><?php echo $y ?> visits <?php echo $start->format('l, M j'); ?></a>
  </span>
<?php endfor; ?>

The link filters the visits by that time span.