Php 向 Woocommerce 添加多个产品属性

我有一个表格可以将新书提交到我的WooCommerce网站.我以前只把书的状态保存为产品属性.

// Set the book's condition

$condition = $_POST['condition'];
wp_set_object_terms( $product_id, $condition, 'pa_condition', true );

$att_condition = Array('pa_condition' =>Array(
       'name'=>'pa_condition',
       'value'=>$condition,
       'is_visible' => '1',
       'is_taxonomy' => '1'
     ));

update_post_meta( $product_id, '_product_attributes', $att_condition);

这很容易.现在，我试图添加书籍作者的姓名和流派，但当我复制代码时，它只设置了最后一个产品属性.我知道我可能应该把它放在一个循环中，但我很愚蠢，否则我就不知道我错过了什么.

$condition = $_POST['condition'];
$genre = $_POST['genre'];
$author = $_POST['author'];
    
wp_set_object_terms( $product_id, $condition, 'pa_condition', true );

$att_condition = Array('pa_condition' =>Array(
       'name'=>'pa_condition',
       'value'=>$condition,
       'is_visible' => '1',
       'is_taxonomy' => '1'
     ));

update_post_meta( $product_id, '_product_attributes', $att_condition);

wp_set_object_terms( $product_id, $genre, 'pa_genre', true );

$att_condition = Array('pa_genre' =>Array(
       'name'=>'pa_genre',
       'value'=>$genre,
       'is_visible' => '1',
       'is_taxonomy' => '1'
     ));

update_post_meta( $product_id, '_product_attributes', $att_genre);

wp_set_object_terms( $product_id, $author, 'pa_author', true );

$att_author = Array('pa_author' =>Array(
       'name'=>'pa_author',
       'value'=>$author,
       'is_visible' => '1',
       'is_taxonomy' => '1'
     ));

update_post_meta( $product_id, '_product_attributes', $att_author);