Wordpress帖子分为两类。 如何在家中展示一次？

Question

I have a loop that displays the posts from Wordpress by category, but some posts are in two categories so on the home page where all the posts are shown, these post appears twice.

Example:

• "Example Post" is in "Category One" and "Category Two"
• When you see the posts of "Category One", "Example Post" is there. The same happens when you see the posts of "Category Two".
• But when you click "see all posts", "Example Post" shows twice (because it's in two categories)

Does anyone know how to "hide" this repeated posts?

This is the loop:

<?php 

    $loop = new WP_Query( array( 'post_type' => 'products', 'posts_per_page' => -1 ) );

    if ( $loop->have_posts() ) :
        while ( $loop->have_posts() ) : $loop->the_post(); ?>


        <?php 
          $my_post_child_cats = array();
            foreach((get_the_category()) as $childcat) { 
                if (cat_is_ancestor_of(3, $childcat)) { ?>


                <div class="item"  data-groups='["all", "<?php echo $childcat->cat_name; ?>"]'>
                    <div class="pindex">
                        <?php if ( has_post_thumbnail() ) { ?>
                            <a href="<?php the_permalink(); ?>">
                            <div class="pimage">
                                <?php the_post_thumbnail(); ?>
                                <div class="pro-title">
                                    <h4><?php echo get_the_title(); ?></h4>
                                    <p>Read more</p></a>
                                </div>
                            </div>
                        <?php } ?>

                    </div>
                </div>

        <?php } } ?>

        <?php endwhile; ?>

    <?php endif;
    wp_reset_postdata();
    ?>

This code will get all the posts and add the category name with this piece: <?php echo $childcat->cat_name; ?>

Then in the home page I've created a filter by category which will take the posts by that $childcat->cat_name;, but when you click "All posts" it will get the posts twice as it has two categories

Answer 1

You could store each post name in an array and then only output it if it's not already been displayed. Something like this:

<?php 
$array[];
$loop = new WP_Query( array( 'post_type' => 'products', 'posts_per_page' => -1 ) );

if ( $loop->have_posts() ) :
    while ( $loop->have_posts() ) : $loop->the_post(); ?>


    <?php 
      $my_post_child_cats = array();
        foreach((get_the_category()) as $childcat) { 
            if (cat_is_ancestor_of(3, $childcat)) { ?>


            <div class="item"  data-groups='["all", "<?php echo $childcat->cat_name; ?>"]'>
                <div class="pindex">

                    <?php if ( has_post_thumbnail() && !in_array(get_the_title(), $array) ) { ?>
                        <a href="<?php the_permalink(); ?>">
                        <div class="pimage">
                            <?php the_post_thumbnail(); ?>
                            <div class="pro-title">
                                <h4><?php echo get_the_title();
                                 $array[] = get_the_title();
                                 ?></h4>
                                <p>Read more</p></a>
                            </div>
                        </div>
                    <?php } ?>

                </div>
            </div>

    <?php } } ?>

    <?php endwhile; ?>

<?php endif;
wp_reset_postdata();
?>

You'll possibly need to tweak the code to suit your need but what this code does is essentially grabs the name/title of the post and stores it in an array:

$array[] = get_the_title();

Then on subsequent loops checks to see if the title of the current looped post is in the array:

if ( has_post_thumbnail() && !in_array(get_the_title(), $array) )

If it is, then nothing should be output. If it isn't then we output the relevant content and store the title of the post in to the array.