stdClass的对象转换为PHP数组

问题描述：

我取POST_ID从postmeta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 ."')");

当我尝试的print_r（$ POST_ID）;
我有数组是这样的：

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
        )

)

和我不知道如何遍历它，我怎么能拿阵列像这样

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

Array
(
    [0]  => 140


    [1] => 141


    [2] => 142

)

任何想法，我怎么能做到这一点.......在此先感谢

Any idea how can I do this.......Thanks in advance

答

最简单的方法是JSON-EN code你的对象，然后去code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，如果你preFER，您可以手动遍历对象，也：

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

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

演示！

stdClass的对象转换为PHP数组

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