Php 从自定义分类中的自定义帖子类型帖子中提取第一个特色图像

没有您的帖子类型或分类法，很难测试这是否有效.然而，这应该是可行的.

正如注释中所述，您需要使用get\u the\u ID()，我还认为您需要get_term_link函数，而不是get_category_link函数，因为post分类法category是默认的WordPress类别分类法.

$limit   = 999;
$counter = 0;
$cats    = get_terms(
    array(
        'taxonomy'   => 'categories',
        'hide_empty' => false,
    )
);

foreach ( $cats as $cat ) :
    if ( $counter < $limit ) {
        $args    = array(
            'posts_per_page'      => 1,
            'post_type'           => 'gallery',
            'ignore_sticky_posts' => 1,
            'tax_query'           => array(
                array(
                    'taxonomy' => 'categories',
                    'terms'    => $cat->term_id,
                    'field'    => 'term_id',
                ),
            ),
        );
        $results = new WP_Query( $args );
        if ( $results->have_posts() ) {
            echo '<div class="col-md-3 category-list">';
            foreach ( $results->get_posts() as $the_post ) :
                echo '<a href="' . esc_url( get_term_link( $cat->term_id, 'categories' ) ) . '"><div class="cat-list-img">';
                $image = get_the_post_thumbnail( $the_post->ID, 'medium' ); // replace with whatever size you want here.
                echo $image;
                echo '<h5 class="cl-title">' . esc_attr( $cat->name ) . '</h5>';
                echo '</div></a>';
                echo '</div>';
            endforeach;
        }
    }

    $counter++;
endforeach;