自定义元数据不在编辑模式下显示多选数据

我有一个自定义post类型的自定义metabox，用于记录我所在校园内的系统停机情况。metabox中的一个字段是一个多选框，其中列出了校园中的所有建筑。

当我保存帖子时，我能够检索前端的建筑阵列。但是，如果我返回编辑帖子，multiselect不会高亮显示以前选择的建筑列表。因此，如果我更新帖子，我必须记住还要重新突出显示受停电影响的建筑物。所有其他（非数组）字段成功保留其数据。

Adding the custom MetaBox:

function add_custom_meta_box() {
    add_meta_box(\'system_outage\',\'System Outage\',\'show_system_outage\',\'outage\',\'normal\',\'high\');
    }
add_action(\'add_meta_boxes\', \'add_custom_meta_box\');

Create Field Array:

$prefix = \'sysout_\';
$outage_meta_fields = array(
    array(
        \'label\' => \'Buildings Affected\',
        \'desc\' => \'Select the buildings affected\',
        \'id\' => $prefix.\'buildings\',
        \'type\' => \'multiselect\',
        \'options\' => array(
            \'building1\' => array(
                \'label\' => \'Building 1\',
                \'value\' => \'building1\'
            ),
            \'building2\' => array(
                \'label\' => \'Building 2\',
                \'value\' => \'building2\' //This continues for a while
            )
        )
    );
);

The Callback:

function show_system_outage() {
    global $outage_meta_fields, $post;
    echo \'<input type="hidden" name="custom_meta_box_nonce" value="\'.wp_create_nonce(basename(__FILE__)).\'" />\';
    echo \'<table class="form-table">\';
        foreach ($outage_meta_fields as $field) {
            $meta = get_post_meta($post->ID, $field[\'id\'], true);
            echo \'<tr>\';
                echo \'<th><label for="\'.$field[\'id\'].\'">\'.$field[\'label\'].\'</label></th>\';
                echo \'<td>\';
                    switch($field[\'type\']) {

                        case \'multiselect\':
                            echo \'<select data-placeholder="Choose a building..." multiple="true" class="chosen" name="\'.$field[\'id\'].\'[]" id="\'.$field[\'id\'].\'">\';
                            foreach ($field[\'options\'] as $option) {
                                echo \'<option\', $meta == $option[\'value\'] ? \' selected="selected"\' : \'\', \' value="\'.$option[\'value\'].\'">\'.$option[\'label\'].\'</option>\';
                            }
                            echo \'</select><br /><span class="description">\'.$field[\'desc\'].\'</span>\';
                        break;

                    }
                echo \'</td>\';
            echo \'</tr>\';
        }
    echo \'</table>\';
}

And Then I Save the Data:

function save_custom_meta($post_id) {
    global $outage_meta_fields;

    if (!wp_verify_nonce($_POST[\'custom_meta_box_nonce\'], basename(__FILE__)))
        return $post_id;
    if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE)
        return $post_id;
    if (\'page\' == $_POST[\'post_type\']) {
        if (!current_user_can(\'edit_page\', $post_id))
            return $post_id;
    }
    elseif (!current_user_can(\'edit_post\', $post_id)) {
        return $post_id;
    }

    foreach ($outage_meta_fields as $field) {
        $old = get_post_meta($post_id, $field[\'id\'], true);
        $new = $_POST[$field[\'id\']];
        if ($new && $new != $old) {
            update_post_meta($post_id, $field[\'id\'], $new);
        }
        elseif (\'\' == $new && $old) {
            delete_post_meta($post_id, $field[\'id\'], $old);
        }
    }

}
add_action(\'save_post\', \'save_custom_meta\');

我希望我已经把它格式化了，这样它就可以模糊地阅读了。

对此，我们将不胜感激。谢谢

case \'multiselect\': echo \'<select name="\'.$field[\'id\'].\'" id="\'.$field[\'id\'].\'">\'; foreach ($field[\'options\'] as $option) { echo \'<option\', $meta == $option[\'value\'] ? \' selected="selected"\' : \'\', \' value="\'.$option[\'value\'].\'">\'.$option[\'label\'].\'</option>\'; } echo \'</select><br /><span class="description">\'.$field[\'desc\'].\'</span>\'; break;

$prefix = \'sysout_\'; $outage_meta_fields = array( array( \'label\' => \'Buildings Affected\', \'desc\' => \'Select the buildings affected\', \'id\' => $prefix.\'buildings\', \'type\' => \'multiselect\', \'options\' => array( \'Select\' => array( \'label\' => \'Select\', \'value\' => \'\' ), \'building1\' => array( \'label\' => \'Building 1\', \'value\' => \'building1\' ), \'building2\' => array( \'label\' => \'Building 2\', \'value\' => \'building2\' //This continues for a while ) ) ) );

$prefix = \'sysout_\'; $outage_meta_fields = array( array( \'label\' => \'Buildings Affected\', \'desc\' => \'Select the buildings affected\', \'id\' => $prefix.\'buildings\', \'type\' => \'chosen\', //This was only changed to match the instructions \'multiple\' => true, //This didn\'t have to be an option - I could have added multiple="multiple" in the HTML below \'options\' => array( \'building1\' => array( \'label\' => \'Building 1\', \'value\' => \'building1\' ), \'building2\' => array( \'label\' => \'Building 2\', \'value\' => \'building2\' ) ) ) );

case \'chosen\': echo \'<select name="\'.$field[\'id\'].\'[]" id="\'.$field[\'id\'].\'"\' , $field[\'type\'] == \'chosen\' ? \' class="chosen"\' : \'\' , isset( $field[\'multiple\'] ) && $field[\'multiple\'] == true ? \' multiple="multiple"\' : \'\' , \'>\'; foreach ( $field[\'options\'] as $option ) echo \'<option value="\' . $option[\'value\'] . \'"\' , is_array( $meta ) && in_array( $option[\'value\'], $meta ) ? \' selected="selected"\' : \'\' , \' >\' . $option[\'label\'] . \'</option>\'; echo \'</select><br />\' . $field[\'desc\']; break;

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