wordpress get_the_category 返回空 [英] wordpress get_the_category returns empty

问题描述

保存新评论后，我可以通过functions.php重定向

After a new comment is saved, I’m able to redirect via functions.php

add_filter('comment_post', 'myredirect');

我想重定向到产品类别列表，例如:http://example.org/baktec27/?product_cat=1a

I want to redirect to the product category listing, say: http://example.org/baktec27/?product_cat=1a

所以我需要当前帖子的类别.无法从functions.php 访问$post 所以从$GLOBALS 获取post_id

So I need the category for the current post. Couldn’t access $post from functions.php so got post_id from $GLOBALS

$post_id = $GLOBALS[_POST][comment_post_ID];    // ok

//根据 https://developer.wordpress.org/reference/functions/get_the_category/

//也试过 wp_get_post_categories( $post_id )

// also tried wp_get_post_categories( $post_id )

$categories = get_the_category($post_id);

if ( ! empty( $categories ) ) {
    file_put_contents('testfile2.txt', esc_html( $categories[0]->name));
} else {
    file_put_contents('testfile2.txt', "NOTHING HERE");
}

我得到一个空的 $categories.

I get an empty $categories.

你能帮忙吗?非常感谢！

Can you help? Thanks a lot!

推荐答案

我使用 WooCommerce - 获取产品页面的类别

$terms = get_the_terms( $post_id, 'product_cat' );
foreach ($terms as $term) {
    $product_cat_id = $term->slug;
    break;
}

当我寻找产品而不是帖子时发现它.:-)

Foundit when i looked for product instead of post. :-)

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