Php wordpress中将多个元字段值保存为数组的问题

我使用相同的名称创建自定义字段，在元字段中，我从DB恢复值，并希望将它们保存为模式中的序列化

像这样：

Array
(
    [job] => 'sdfsdf'
    [image] => Array
        (
            [attachment_id] => '2121' 
            [url] => 'http://siteurl.com/wp-content/uploads/2016/04/image.jpg'
        )

    [popup_text] => 'A quick brown fox jumps over the lazy dog.'
)

但当我保存这些值时，所有值都恢复为空

下面是我的元字段代码：

global $wpdb;

    $dsl_fw_options = get_post_meta($post->ID, 'dsl_fw_options', true);

    $dsl_staff_qry = $wpdb->get_row("Select * From ". $wpdb->posts . " Where ID = ".$post->ID);

    $dsl_staff_parent = $wpdb->get_row("Select * From ". $wpdb->posts . " Where post_parent = " . $post->ID . " And post_type = 'attachment' And (post_mime_type = 'image/jpeg' Or post_mime_type = 'image/png')");

?>
    <table width="100%" cellspacing="2" cellpadding="2" border="0">
        <tr>
            <td width="20%">
                <strong>Job Title</strong>
            </td>
            <td width="80%">
                <input type="text" name="dsl_txt_fw_options['job']" value="<?php echo $dsl_fw_options['job'] ?>" style="width: 50%;">
            </td>
        </tr>
        <tr>
            <td>
                <input type="text" name="dsl_txt_fw_options['attachment_id']" value="<?php echo $dsl_staff_parent->ID; ?>" style="width: 50%;">
                <br>
                <input type="text" name="dsl_txt_fw_options['url']" value="<?php echo $dsl_staff_parent->guid; ?>" style="width: 50%;">
                <br>
                <textarea name="dsl_txt_fw_options['popup_text']"><?php echo $dsl_staff_qry->post_content; ?></textarea>
            </td>
        </tr>
    </table>

当我保存这些值并检查DB中的值时，会得到以下结果：

a:3:{s:3:"job";N;s:5:"image";a:2:{s:13:"attachment_id";N;s:3:"url";N;}s:10:"popup_text";N;}

---

我不知道我哪里做错了，所以请指导我。

首先更改每个输入类型的名称。像

<table width="100%" cellspacing="2" cellpadding="2" border="0">
        <tr>
            <td width="20%">
                <strong>Job Title</strong>
            </td>
            <td width="80%">
                <input type="text" name="dsl_txt_fw_job" value="<?php echo $dsl_fw_options['job ?>" style="width: 50%;">
            </td>
        </tr>
        <tr>
            <td>
                <input type="text" name="dsl_txt_fw_attachment_id" value="<?php echo $dsl_staff_parent->ID; ?>" style="width: 50%;">
                <br>
                <input type="text" name="dsl_txt_fw_url" value="<?php echo $dsl_staff_parent->guid; ?>" style="width: 50%;">
                <br>
                <textarea name="dsl_txt_fw_popup_text"><?php echo $dsl_staff_qry->post_content; ?></textarea>
            </td>
        </tr>
    </table>

之后，可以将这些值转换为所需格式的数组。像

$dsl_val['job'] = $dsl_val_job;

$dsl_val['image'] = array ( 'attachment_id' => $dsl_val_attachment_id, 

                             'url'=>  $dsl_val_url );

$dsl_val['popup_text'] = $dsl_val_popup_text; 

就这样。：-）

$dsl_val_job = $_POST['dsl_txt_fw_job'];

$dsl_val_attachment_id = $_POST['dsl_txt_fw_attachment_id'];

$dsl_val_url = $_POST['dsl_txt_fw_url'];

$dsl_val_popup_text = $_POST['dsl_txt_fw_popup_text'];

$dsl_val['job'] = $dsl_val_job;

$dsl_val['image'] = array ( 'attachment_id' => $dsl_val_attachment_id, 

                             'url'=>  $dsl_val_url );

$dsl_val['popup_text'] = $dsl_val_popup_text;