controlador-descarga/views/reporte/index.php

<?php

/* @var $descargas app\models\Descarga[] */
/* @var $estaciones array */
/* @var $primer \DateTime */
/* @var $ultimo \DateTime */

?>
<style>
  .scroll {
    overflow-x: scroll;
  }
  .celda {
    text-align: center; 
    color: #d4d4d4; 
  }
</style>
<div class="scroll">
  <table class="table is-bordered is-striped is-narrow is-hoverable is-fullwidth">
    <thead>
      <tr>
        <th>pc</th>
        <th>ciudad</th>
        <th>clave</th>
        <th>siglas</th>
        <th>frecuencia</th>
        <?php $f = (clone $primer); ?>
        <?php while($f <= $ultimo): ?>
          <th>
          <?= $f->format("d/m/Y") ?>
          </th>
          <?php $f->add(new \DateInterval("P1D")); ?>
        <?php endwhile; ?>
      </tr>
    </thead>
    <tbody>
    <?php $estacion = ""; ?>
    <?php foreach ($estaciones as $pc => $est): ?>
      <?php foreach($est as $clave => $info): ?>
        <tr>
          <td><?= $pc ?></td>
          <td><?= $info['ciudad'] ?></td>
          <td><?= $clave ?></td>
          <td><?= $info['siglas'] ?></td>
          <td><?= $info['frecuencia'] ?></td>
          <?php $fecha = (clone $primer); ?>
          <?php while($fecha <= $ultimo): ?>
            <?php $d = null; ?>
            <?php if(isset($descargas[$pc][$clave][$fecha->format("Y-m-d")])): ?>
              <?php $d = $descargas[$pc][$clave][$fecha->format("Y-m-d")]; ?>
            <?php endif; ?>
            <?php if($d !== null): ?>
              <td style="background-color: <?= $d["color"] ?>;" class="celda">
              <?= $d["descargados"] ?> / <?= $d["total"] ?>
              </td>
            <?php else: ?>
              <td></td>
            <?php endif; ?>
            <?php $fecha->add(new \DateInterval("P1D")); ?>
          <?php endwhile ?>
        </tr>
      <?php endforeach ?>
    <?php endforeach ?>
    </tbody>
  </table>
</div>