我只想从前端更新（编辑现有的）自定义meta-box变量。我有张表格Front end post editing using a form &；处理事情，但在此代码帖子标题中，我可以编辑（&P）；更新，但我无法编辑（&A）；更新值自定义metabox变量值。

global $current_user;
wp_get_current_user();

if ( \'POST\' == $_SERVER[\'REQUEST_METHOD\'] && ! empty($_POST[\'post_id\']) && ! empty($_POST[\'post_title\']) && isset($_POST[\'update_post_nonce\']) && isset($_POST[\'postcontent\']) )
{
$post_id   = $_POST[\'post_id\'];
$post_type = \'testimonial\';
$capability = ( \'page\' == $post_type ) ? \'edit_page\' : \'edit_post\';
if ( current_user_can($capability, $post_id) && wp_verify_nonce( $_POST[\'update_post_nonce\'], \'update_post_\'. $post_id ) )
{ 
    $post = array(
    \'ID\'             => esc_sql($post_id),
    \'post_content\'   => esc_sql($_POST[\'postcontent\']),
    \'post_title\'     => esc_sql($_POST[\'post_title\'])
);
    wp_update_post($post);

    if ( isset($_POST[\'package\']) ) update_post_meta($post_id, \'zon_package\', esc_sql($_POST[\'zon_package\']) );
    if ( isset($_POST[\'phone\']) ) update_post_meta($post_id, \'zon_phone\', esc_sql($_POST[\'zon_phone\']) );
                    }
                    else
                    {
                        wp_die("You can\'t do that");
                    }
                }

$args = array(
    \'post_type\' => \'testimonial\',
    \'post_status\' => \'publish\',
    \'post_per_page\' => 5,
    \'author\' => $current_user->ID,
    \'meta_query\' => array(
        array(
            \'key\' => \'_zon_testimonial_key\',
            \'value\' => \'s:8:"approved";i:1;s:8:"featured";i:0;\',
            \'compare\' => \'LIKE\'
            )
    )
);
$query =new WP_Query($args);
if ($query->have_posts() || is_user_logged_in() || current_user_can(\'edit_post\', $args->ID)) :
while ($query->have_posts()) : $query->the_post();
echo \'<p>\'.get_the_title().\'</p>\';
?>


<form class="royal_page" role="form" method="post">                 
        <input type="hidden" name="post_id" value="<?php the_ID(); ?>" />
        <?php wp_nonce_field( \'zon_testimonial\'.  get_the_ID(), \'zon_testimonial_nonce\' );?>

        <p><label for="post_title">Title</label>
    <input type="text" id="post_title" name="post_title" value="<?php echo $post->post_title; ?>" /></p>

    <p><?php wp_editor( $post->post_content, \'postcontent\' ); ?></p>

        <p><label for="post_title">Package</label>
        <?php $value = get_post_meta(get_the_ID(), \'_zon_testimonial_key\', true); ?>
        <input type="text" id="zon_package" name="zon_package" value="<?php echo esc_attr($value["package"]); ?>" /></p>

        <p><label for="post_title">Phone</label>
        <?php $value = get_post_meta(get_the_ID(), \'_zon_testimonial_key\', true); ?>
        <input type="text" id="zon_phone" name="zon_phone" value="<?php echo $value["phone"]; ?>" /></p>

    <input type="submit" id="submit" value="Update" />           
   </form>      

<?php endwhile; endif; ?>