无法使用数组更新帖子元 [英] Can't update post meta using array

问题描述

我正在尝试使用 update_post_meta()并保存来自数组.

I am trying to use update_post_meta() and save a post meta from Array.

示例:

$thing_to_add = array( '507' => 500, '366' => 550 );
update_post_meta($post_id, 'thing_to_add', $thing_to_add);

我想将整个 $ thing_to_add 保存在我的帖子元中，但它没有保存.如果 $ thing_to_add 是字符串，它将更新.但是我想保存数组.我怎样才能做到这一点?

I want to save the whole $thing_to_add in my post meta, but it is not saving it . If $thing_to_add is a string, it updates. But I want to save the array. How can I do that?

我在下面提供了完整的代码.

I've included my full code below.

<input type="number" name="inventory_id[507]" />
<input type="number" name="inventory_id[366]" />
$inventory_ids = $_POST['inventory_id'];
//var_dump shows this - array(2) { [507]=> string(2) "500" [366]=> string(2) "550" }
update_post_meta($post_id, 'inventory_ids', $inventory_ids);

已解决::从下面的DavidWinder的评论中，我只是注意到它会自动序列化数组并将其保存在DB中.但是，它不会显示在帖子编辑页面上.

Solved: From DavidWinder's comment below, I just noticed it automatically serializes the array and saves it in DB. However it doesn't show on post edit page.

推荐答案

请注意 update_post_meta 可以将数据保存为数组，但会自动序列化.

Notice that update_post_meta can save data as array but it is automatically serialized.

如果要将值作为数组取回，则应使用

If you want to get the value back as array you should use the flag $single of the get_post_meta.

在您的情况下:

<input type="number" name="inventory_id[507]" />
<input type="number" name="inventory_id[366]" />
$inventory_ids = $_POST['inventory_id'];

//var_dump shows this - array(2) { [507]=> string(2) "500" [366]=> string(2) "550" }

// save the meta
update_post_meta($post_id, 'inventory_ids', $inventory_ids);

// get the meta
$inventory_ids_from_meta = get_post_meta( $post_id, 'inventory_ids', true ); // this is the true flag

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