Exemplo

<?php
  foreach ($ft as $fts) {
    $cont = 1;
    ?>
    <table width="100%" border="1">
      $resto = $cont % 2;
      if ($resto != 0) {
        <tr>
          <th>
            <img style="height: 50%; width: 50%;" src="assets/img/fotos_preliminares/<?=$fts['img']; ?>" class="img-responsive">
            <div class="well" style="width: 50%;">
              <?=str_replace('.jpeg', '', $fts['texto']); ?>
            </div>
          </th>
      } else {
        <th>
            <img style="height: 50%; width: 50%;" src="assets/img/fotos_preliminares/<?=$fts['img']; ?>" class="img-responsive">
            <div class="well" style="width: 50%;">
              <?=str_replace('.jpeg', '', $fts['texto']); ?>
            </div>
          </th>
        </tr>
      }
    </table>
    <div class="col-sm-6">
    </div>
    <?php
    $cont ++;
  }
?>