Question

我希望每次在它上面有一个循环项目时，在我的循环中为一个项添加一个类，所以像这样：

loopitem1
loopitem2 <- add class to this one
loopitem3
loopitem4 <- add class to this one
loopitem5
loopitem6 <- add class to this one

我该如何做到这一点？

我的循环看起来像这样：

while ($timeline = $fetchtimeline->fetch(PDO::FETCH_ASSOC)) {

}

提前致谢！

编辑;我现在拥有的东西;

            <?php
            $counter = 0;

            while ($timeline = $fetchtimeline->fetch(PDO::FETCH_ASSOC)) {
                $inverted = "";
                if($counter == 2) {
                    $inverted = 'class="timeline-inverted"';
                    $counter = 0;
                } else {
                    $counter++;
                }
                ?>
    <li <?php echo $inverted; ?>>
      <div class="timeline-badge primary"><i class="fa fa-hashtag"></i></div>
      <div class="timeline-panel">
        <div class="timeline-heading">
          <h4 class="timeline-title"><?php echo $timeline['title']; ?></h4>
          <p><small class="text-muted"><?php echo $engine->readable($timeline['timestamp']); ?> by <?php echo $engine->pullName($timeline['postedby']); ?></small></p>
        </div>
        <div class="timeline-body">
          <p><?php echo $timeline['content']; ?></p>
        </div>
      </div>
    </li>
                <?php
            }
            ?>

Answer 1

使用计数器跟踪您所处的循环次数，并确保在每次成功的第二次循环时重置它。

$this->upload->initialize($config2);

Answer 2

如评论所述，请使用the modulo operator。特别针对您的示例代码：

$i = 0;
while ($timeline = $fetchtimeline->fetch(PDO::FETCH_ASSOC)) {
    $i++;
    if ($i % 2 === 0) {
        // add your class here
    }
}

Answer 3

你可以使用数字模数

<?php

$array = [1,2,3,4,5,6,7,8,9];

foreach ($array as $a) {
    if ( $a % 2 == 0 ) {
        echo $a;
    }
}

PHP循环 - 每次检查循环是否为第二项

3 个答案: