无法使用数组更新发布元 [英] Can't update post meta using array

问题描述

我正在尝试使用 update_post_meta（）并从
数组中保存帖子元。

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);

我要保存整个 $ thing_to_add 在我的帖子meta中，但它没有保存。如果 $ thing_to_add 是字符串，则会更新。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?

我在下面包括了我的完整代码。

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数据库中。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

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.

如果您想将值恢复为数组，则应使用标志< get_post_meta 的code> $ single 。

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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