Php wordpress while循环中的第一篇帖子

我正在尝试使用高级自定义字段在WordPress中创建一个引导转盘

循环中的第一个“转盘项目”必须具有“活动”类。我不知道如何定义if条件，以便将类添加到循环的第一次迭代中

转盘指示器的情况也是如此。 类active应该添加到第一次迭代中，数据slide to=“x”应该是循环的计数器。你知道如何让计数和班级运转吗

<section>
    <div id="theCarousel" class="carousel slide" data-ride="carousel" data-interval="false">
        <ol class="carousel-indicators">
            <li data-target="#theCarousel" data-slide-to="0" class="active"></li>
            <li data-target="#theCarousel" data-slide-to="1"></li>
            <li data-target="#theCarousel" data-slide-to="2"></li>
        </ol>

        <div class="carousel-inner" role="listbox">
            <?php $loop = new WP_Query( array ( 'post_type' => 'carousel', 'orderby' => 'post_id', 'order' => 'ASC') ); ?>
            <?php while( $loop->have_posts() ): $loop->the_post(); ?>
                <div class="carousel-item" style="background-image: url('<?php the_field('carousel_image'); ?>')">
                    <div class="carousel-caption d-none d-md-block">
                        <h3><?php the_title(); ?></h3>
                        <p><?php the_field('carousel_description'); ?></p>
                    </div>
                </div>
            <?php endwhile; wp_reset_query();?>
        </div>

        <a class="carousel-control-prev" href="#theCarousel" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#theCarousel" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</section>

你可以这样做

      <div class="carousel-inner" role="listbox">
            <?php 
            $iteration = 0;
            $loop = new WP_Query( array ( 'post_type' => 'carousel', 'orderby' => 'post_id', 'order' => 'ASC') ); ?>
            <?php while( $loop->have_posts() ): $loop->the_post(); $iteration++; ?>
                <div class="carousel-item<?php if( $iteration == 1 ) echo ' active' ?>" style="background-image: url('<?php the_field('carousel_image'); ?>')" data-slide-to="<?php echo $iteration ?>">
                    <div class="carousel-caption d-none d-md-block">
                        <h3><?php the_title(); ?></h3>
                        <p><?php the_field('carousel_description'); ?></p>
                    </div>
                </div>
            <?php endwhile; wp_reset_query();?>
        </div>

        <a class="carousel-control-prev" href="#theCarousel" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#theCarousel" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</section>


下面是我如何实现它的。
定义了两个变量。一个用于传送带指示器，一个用于传送带包装器，并在循环中增加它们

$carousel_wrap=0；
$carousel_ind=0

<section>
        <div id="theCarousel" class="carousel slide" data-ride="carousel" data-interval="false">
            <ol class="carousel-indicators">
                <?php $loop = new WP_Query( array ( 'post_type' => 'carousel', 'orderby' => 'post_id', 'order' => 'ASC') ); ?>
                <?php while( $loop->have_posts() ): $loop->the_post(); $carousel_ind++; ?>
                    <li data-target="#theCarousel" data-slide-to="<?php echo $carousel_ind; ?>" class="<?php if( $carousel_ind == 1 ) echo 'active' ?>""></li>
                <?php endwhile; wp_reset_query();?>
            </ol>

            <div class="carousel-inner" role="listbox">
                <?php $loop = new WP_Query( array ( 'post_type' => 'carousel', 'orderby' => 'post_id', 'order' => 'ASC') ); ?>
                <?php while( $loop->have_posts() ): $loop->the_post(); $carousel_wrap++; ?>
                    <div class="carousel-item <?php if( $carousel_wrap == 1 ) echo 'active' ?>" style="background-image: url('<?php the_field('carousel_image'); ?>')">
                        <div class="carousel-caption d-none d-md-block">
                            <h3><?php the_title(); ?></h3>
                            <p><?php the_field('carousel_description'); ?></p>
                        </div>
                    </div>
                <?php endwhile; wp_reset_query();?>
            </div>

            <a class="carousel-control-prev" href="#theCarousel" role="button" data-slide="prev">
                <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                <span class="sr-only">Previous</span>
            </a>
            <a class="carousel-control-next" href="#theCarousel" role="button" data-slide="next">
                <span class="carousel-control-next-icon" aria-hidden="true"></span>
                <span class="sr-only">Next</span>
            </a>
        </div>
    </section>


“style=”背景图像：url（“”）”>

使用for循环即可

for ( $iteration = 0; $the_query->have_posts(); $iteration++  ) : $the_query->the_post(); 
endfor;