<label for="multiplier">Tamanho do Rolo</label>
<?php $largura = str_replace(["_", " ", "cm"], [".", "", ""], $size)/100; ?>
<select class="form-control" id="multiplier" name="multiplier" data-size="<?= $largura?>">
    <option value="6.25">6,25m [<?= number_format(($largura *  6.25), 2, ",", "") ?> M²] - R$ <?= preco_real($price * 6.25)?></option>
    <option value="12.5" <?= $pv < 12 ? "disabled" : ""; ?>>12,5m [<?= number_format(($largura *  12.5), 2, ",", "") ?> M²] -
        <?php if($pv < 12):
            echo "(Indisponível)";
        else: ?>
        R$ <?= preco_real($price * 12.5)?></option>
    <?php endif; ?>
    <option value="25" <?= $pv < 25 ? "disabled" : ""; ?>>25m [<?= number_format(($largura *  25), 2, ",", "") ?> M²] -
        <?php if($pv < 25):
            echo "(Indisponível)";
        else: ?>
        R$ <?= $largura != 1.23 ? preco_real($price * 25): preco_real(($price*CONF_FULL_SIZE_DISCOUNT) * 25)?></option>
    <?php endif;?>
</select>