How to get Category name by id post in wordpress

Question

I want to make an api in wordpress, then I have a create a code like this :

 case 'product_onsale': $response = array(); $args = array( 'post_type' => 'product', 'posts_per_page' => 30, 'meta_query' => array( 'relation' => 'OR', array( // Simple products type 'key' => '_sale_price', 'value' => 0, 'compare' => '>', 'type' => 'numeric' ) , array( // Variable products type 'key' => '_min_variation_sale_price', 'value' => 0, 'compare' => '>', 'type' => 'numeric' ) ) ); $loop = new WP_Query($args); if ($loop->have_posts()): $meta = array( "api_status" => 1, "api_message" => "success", "result" => "" ); $meta = array(); while ($loop->have_posts()): $loop->the_post(); $meta['result'][] = array( "id" => get_the_ID() , "post_name" => get_the_title() , "stock_status" => get_post_meta(get_the_ID() , '_stock_status', true) , "price" => get_post_meta(get_the_ID() , '_price', true) , "regular_price" => get_post_meta(get_the_ID() , '_regular_price', true) , "sale_price" => get_post_meta(get_the_ID() , '_sale_price', true) , "Stock_status" => get_post_meta(get_the_ID() , '_stock_status', true) , "category" => the_category() , endwhile; endif; echo json_encode($meta); break; 

then in there, I want to show the category by post id in my result, I've try add

the_category

what I need to improve in my code so it's can be work like what I want ?

Answer 1

You need to use like below:

        $meta = array();
        while ($loop->have_posts()):
            $loop->the_post();
            $product_cats = wp_get_post_terms( get_the_ID(), 'product_cat' );
            $meta['result'][] = array(
                "id" => get_the_ID() ,
                "post_name" => get_the_title() ,
                "stock_status" => get_post_meta(get_the_ID() , '_stock_status', true) ,
                "price" => get_post_meta(get_the_ID() , '_price', true) ,
                "regular_price" => get_post_meta(get_the_ID() , '_regular_price', true) ,
                "sale_price" => get_post_meta(get_the_ID() , '_sale_price', true) ,
                "Stock_status" => get_post_meta(get_the_ID() , '_stock_status', true) ,
                "category" => $product_cats);
            endwhile;
        endif;
        echo json_encode($meta);

Answer 2

Inside the while loop you can get the categories of that post by get_the_category()

$CatObj = get_the_category();

This will provide you with array of categories in variable $CatObj .

Run a simple foreach loop to get all the categories in an array $catnames .

$catnames = array();
        foreach ($CatObj as $key => $value) {
            $catnames[] = $value->name;
        }

Now by using implode function of php , display comma separated categories inside the while loop , as below :

echo implode(', ', $catnames);