我创建了一个Posteta框，但它似乎没有将任何内容保存到DB。我正在检查wp\\U Posteta，没有任何与此元数据库相关的内容。

我认为这是由于die 显示错误。

问题：是什么导致我的metabox无法保存到数据库，因此不允许我输出结果。

这是我创建/保存元数据库的代码。

<?php
// Add the Meta Box  
function ge_add_subtitle_meta_box() {  
    add_meta_box(  
        \'excerpt_meta_box\', // $id  
        \'Excerpt Meta Box\', // $title   
        \'ge_show_subtitle_meta_box\', // $callback  
        \'page\', // $page  
        \'normal\', // $context  
        \'high\'); // $priority  
}  

//hook the function to add meta boxes
add_action(\'add_meta_boxes\', \'ge_add_subtitle_meta_box\');  

// Field Array  
$prefix = \'getextra\';  
$custom_meta_fields = array(  
    array(
        \'label\' => \'Subtitle\',
        \'desc\'  => \'Insert a small description of the page underneath this title.\',  
        \'id\'    => $prefix.\'subtitle\',  
        \'type\'  => \'textarea\' 
        )
);  

// The Callback  
function ge_show_subtitle_meta_box() {  
//make array globalscope and call $post to acces global array
global $custom_meta_fields, $post;  
// Use nonce for verification  
echo \'<input type="hidden" name="subtitle_meta_box_nonce" value="\'.wp_create_nonce(basename(__FILE__)).\'" />\';  

    // Begin the field table and loop  
    echo \'<table class="form-table">\';  
    foreach ($custom_meta_fields as $field) {  
        // get value of this field if it exists for this post  
        $meta = get_post_meta($post->ID, $field[\'id\'], true);  
        // begin a table row with  
        echo \'<tr> 
                <th><label for="\'.$field[\'id\'].\'">\'.$field[\'label\'].\'</label></th> 
                <td>\';  
                switch($field[\'type\']) {  
                    // case items will go here  
                    // text  
case \'text\':  
    echo \'<input type="text" name="\'.$field[\'id\'].\'" id="\'.$field[\'id\'].\'" value="\'.$meta.\'" size="30" /> 
        <br /><span class="description">\'.$field[\'desc\'].\'</span>\';  
break;  
// textarea  
case \'textarea\':  
    echo \'<textarea name="\'.$field[\'id\'].\'" id="\'.$field[\'id\'].\'" cols="60" rows="4">\'.$meta.\'</textarea> 
        <br /><span class="description">\'.$field[\'desc\'].\'</span>\';  
break; 
// checkbox  
case \'checkbox\':  
    echo \'<input type="checkbox" name="\'.$field[\'id\'].\'" id="\'.$field[\'id\'].\'" \',$meta ? \' checked="checked"\' : \'\',\'/> 
        <label for="\'.$field[\'id\'].\'">\'.$field[\'desc\'].\'</label>\';  
break; 
// select  
case \'select\':  
    echo \'<select name="\'.$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;  
                } //end switch  
        echo \'</td></tr>\';  
    } // end foreach  
    echo \'</table>\'; // end table  
}  

// Save the Data  
function getextra_save_subtitle_meta($post_id) {  
    global $custom_meta_fields;  

    // verify nonce  
    if (!wp_verify_nonce($_POST[\'subtitle_meta_box_nonce\'], basename(__FILE__))) {
        return $post_id; } else { die( \'failed to verify nonce\' ); }

    // check autosave  
    if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE)  
        return $post_id;  

    // check permissions  
    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;  
    }  

    // loop through fields and save the data  
    foreach ($custom_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);  
        }  
    } // end foreach  
}  
//hook into save the post
add_action(\'save_post\', \'ge_save_subtitle_meta\');    
?>