php 特色/主要类别Yoast +后备

Posted 2021-05-05

<?php
// SHOW YOAST PRIMARY CATEGORY, OR FIRST CATEGORY
$category = get_the_terms( get_the_id(), $term_slug );
$useCatLink = false;
// If post has a category assigned.
if ($category){
    $category_display = '';
    $category_link = '';
    if ( class_exists('WPSEO_Primary_Term') )
    {
        // Show the post's 'Primary' category, if this Yoast feature is available, & one is set
        $wpseo_primary_term = new WPSEO_Primary_Term( $term_slug , get_the_id() );
        $wpseo_primary_term = $wpseo_primary_term->get_primary_term();
        $term = get_term( $wpseo_primary_term );
        if (is_wp_error($term)) { 
            // Default to first category (not Yoast) if an error is returned
            $category_display = $category[0]->name;
            $category_link = get_category_link( $category[0]->term_id );
        } else { 
            // Yoast Primary category
            $category_display = $term->name;
            $category_link = get_term_link( $term->term_id );
        }
    } 
    else {
        // Default, display the first category in WP's list of assigned categories
        $category_display = $category[0]->name;
        $category_link = get_term_link( $category[0]->term_id );
    }
    // Display category
    if ( !empty($category_display) ){
        if ( $useCatLink == true && !empty($category_link) ){
        echo '<span class="post-category">';
        echo '<a href="'.$category_link.'">'.$category_display.'</a>';
        echo '</span>';
        } else {
        echo '<p class="tag tag-small tag-white card--tag">'.$category_display.'</p>';
        }
    }
    
} ?>