在 PHP 中将 stdClass 对象转换为数组

问题描述：

我从 postmeta 中获取 post_id 为:

I fetch post_id from postmeta as:

$post_id = $wpdb->get_results("SELECT post_id FROM $wpdb->postmeta WHERE (meta_key = 'mfn-post-link1' AND meta_value = '". $from ."')");

当我尝试 print_r($post_id);我有这样的数组:

when i try print_r($post_id); I have array like this:

Array
(
    [0] => stdClass Object
        (
            [post_id] => 140
        )

    [1] => stdClass Object
        (
            [post_id] => 141
        )

    [2] => stdClass Object
        (
            [post_id] => 142
        )

)

我不知道如何遍历它，我怎么能得到这样的数组

and i dont know how to traverse it, and how could I get array like this

Array
(
    [0]  => 140


    [1] => 141


    [2] => 142

)

知道我该怎么做吗?

答

最简单的方法是对对象进行 JSON 编码，然后将其解码回数组:

The easiest way is to JSON-encode your object and then decode it back to an array:

$array = json_decode(json_encode($object), true);

或者，如果您愿意，也可以手动遍历对象:

Or if you prefer, you can traverse the object manually, too:

foreach ($object as $value) 
    $array[] = $value->post_id;

在 PHP 中将 stdClass 对象转换为数组

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