Question

尝试为每个必须从0开始的图像获得越来越多的数字，它当前从1输出，我不知道为什么！

感谢任何帮助，提前谢谢！

  <div id="carousel">

    <ul class="thumbs">

   <?php $counts = 0 ; ?>

        <?php  foreach( $images as $image ): $counts++; ?>
            <li>
                <a data-slide-index="<?php echo $counts ;?>" href="">
<img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" /></a>
            </li>

<?php endforeach; ?>

    </ul>
  </div>

<?php endif; ?>

Answer 1

foreach( $images as $image ): $counts++;

在第一次迭代时运行。因此

$counts = 0;
foreach( $images as $image ): $counts++;

$counts == 1 // true on first iteteration

你可以做

$counts = -1 // Code smell!

或

<?php 
$counts = 0 ;  
foreach( $images as $i => $image )?>
<li>
  <a data-slide-index="<?php echo $i ?>" href="#">
     <img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" /></a>
</li>
<?php endforeach; ?>

Answer 2

在使用之前增加$counts。你从0开始，但是一旦你启动foreach并运行$counts++;它就会变为1。

将$counts++;移动到foreach循环的末尾。

<?php $counts = 0 ; ?>
<?php foreach( $images as $image ) : ?>
    <li>
        <a data-slide-index="<?php echo $counts; ?>" href="">
            <img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" />
        </a>
    </li>

    <?php $counts++; ?>
<?php endforeach; ?>

Answer 3

因为您在$counts

之前增加了echo

所以就这样做：

<?php $counts = -1 ; ?>

或者这个：

foreach( $images as $image )
{
    echo '<li>
        <a data-slide-index="' . $counts . '" href="">
        <img src="' . $image['sizes']['thumbnail'] . '" alt="' . $image['alt'] . '" /></a>
    </li>';
    $counts++;
}

Answer 4

而不是

<?php foreach( $images as $image ): $counts++; ?>

做

<?php $counts++; endforeach; ?>

在文本打印后增加。

Answer 5

编写如下代码：

<div id="carousel">

    <ul class="thumbs">

   <?php $counts = 0 ; ?>

        <?php  foreach( $images as $image ) { ?>
            <li>
                <a data-slide-index="<?php echo $counts ;?>" href="">
<img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" /></a>
            </li>



<?php  $counts++; }  ?>

    </ul>
  </div>

<?php endif; ?>

Answer 6

尝试此代码

    <div id="carousel">

    <ul class="thumbs">

   <?php $counts = 0 ; ?>

        <?php  foreach( $images as $image ): $counts++; ?>
            <li>
                <a data-slide-index="<?php if($counts == 1){echo '0';}else {echo $counts 
 ;} ?>" href="">
<img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" /></a>
            </li>

<?php endforeach; ?>

    </ul>
  </div>

<?php endif; ?>

PHP循环从0开始而不是1

6 个答案: