EDIT: Reworded the question for more clarity

我正在尝试按自定义元框数据排序，我正在使用strtotime 功能，但我有一些困难。

我的主要问题似乎是strtotime 作用如果我使用strtotime 在循环内部（见下文），我无法使用UNIX时间按日期排序。然而，如果我在保存时处理strotime（在functions.php中），那么如果用户编辑帖子或重新保存，我就会遇到一系列元框更新/不解析的问题。

有没有简单的解决方案？这是代码。。。我只想按自定义日期字段（而不是发布日期）升序排列这些帖子。

EDIT: Fixed the array by adding a meta-key - solution still pending

<!-- The args -->
<?php
$args = array(
    "post_type" => "podcasts",
    "meta-key" => "_date",
    "orderby" => "meta_value",
    "order" => "ASC"
    );
?>

<!-- The Query -->
<?php $podcasts = new WP_Query( $args ); ?>

<!-- The Loop -->
<?php if ( $podcasts->have_posts() ) : while ( $podcasts->have_posts() ) : $podcasts->the_post(); ?>

<!-- Convert Date to Date Stamp -->
<?php $podcast_date = get_post_meta($post->ID, \'_date\', true);?>
<?php $fixed_date = strtotime($podcast_date); ?>

<!-- Content -->

EDIT: Added relevant meta-box code (below) from functions.php 注意——这段代码不包括strotime函数，因为我目前正在页面模板上使用它。我可以把它包括在这里，但我不知道该怎么做才能允许用户编辑帖子/重新保存。一旦strotime函数在保存时运行，它会不会将元框日期更改为1327248252之类的值？如果是这样的话，那么下次保存帖子时就不会进行解析，从而产生问题。

// Create podcast Meta boxes

function add_podcast_metaboxes() {
add_meta_box(\'podcast_info\', \'podcast Information\', \'podcast_info\', \'podcasts\',  \'normal\', \'high\');
}

// podcast Meta Box

function podcast_info() {
global $post;

// Noncename needed to verify where the data originated
echo \'<input id="podcastmeta_noncename" name="podcastmeta_noncename" type="hidden" value="\' .     wp_create_nonce( plugin_basename(__FILE__) ) . \'" />\';

// Get the data if its already been entered
$week = get_post_meta($post->ID, \'_week\', true);
$date = get_post_meta($post->ID, \'_date\', true);
$description = get_post_meta($post->ID, \'_description\', true);

// Echo out the field
echo \'<strong>Week</strong><br /><em>What week of the series is this podcast?</em>\';
echo \'<input class="widefat" name="_week" type="text" value="\' . $week  . \'" />\';
echo \'<strong>Date</strong><br /><em>Enter the Date the podcast was recorded</em>\';
echo \'<input class="widefat" name="_date" type="text" value="\' . $date  . \'" />\';
echo \'<strong>Description</strong><br /><em>Enter the text you would like to display as a description on the media archives list.</em>\';
echo \'<input class="widefat" name="_description" type="text" value="\' . $description  . \'" />\';

}

// Save the podcast Meta box Data

function save_podcast_meta($post_id, $post) {

// verify this came from the our screen and with proper authorization,
// because save_post can be triggered at other times
if ( !wp_verify_nonce( $_POST[\'podcastmeta_noncename\'], plugin_basename(__FILE__) )) {
return $post->ID;
}

// Is the user allowed to edit the post or page?
if ( !current_user_can( \'edit_post\', $post->ID ))
    return $post->ID;

// OK, we\'re authenticated: we need to find and save the data
// We\'ll put it into an array to make it easier to loop though.
$podcast_meta[\'_week\'] = $_POST[\'_week\']; 
$podcast_meta[\'_date\'] = $_POST[\'_date\'];
$podcast_meta[\'_thumbnail\'] = $_POST[\'_thumbnail\'];
$podcast_meta[\'_seriesimg\'] = $_POST[\'_seriesimg\'];
$podcast_meta[\'_description\'] = $_POST[\'_description\'];

// Add values of $podcast_meta as custom fields

foreach ($podcast_meta as $key => $value) { // Cycle through the $podcast_meta array!
    if( $post->post_type == \'revision\' ) return; // Don\'t store custom data twice
    $value = implode(\',\', (array)$value); // If $value is an array, make it a CSV    (unlikely)
    if(get_post_meta($post->ID, $key, FALSE)) { // If the custom field already has a value
        update_post_meta($post->ID, $key, $value);
    } else { // If the custom field doesn\'t have a value
        add_post_meta($post->ID, $key, $value);
    }
    if(!$value) delete_post_meta($post->ID, $key); // Delete if blank
}

}
add_action(\'save_post\', \'save_podcast_meta\', 1, 2); // save the custom fields

$date = get_post_meta( $post->ID, \'_date\', true );
if( $date != \'\' )
    $date = date( \'Y-m-d\', $date );

$podcast_meta[\'_date\'] = strtotime( $_POST[\'_date\'] );

<!-- The args -->
<?php
$args = array(
    "post_type" => "podcasts",
    "meta_key" => "some_meta_key", // Change to the meta key you want to sort by
    "orderby" => "meta_value_num", // This stays as \'meta_value\' or \'meta_value_num\' (str sorting or numeric sorting)
    "order" => "ASC"
    );
?>

<!-- The Query -->
<?php $podcasts = new WP_Query( $args ); ?>

<!-- The Loop -->
<?php if ( $podcasts->have_posts() ) : while ( $podcasts->have_posts() ) : $podcasts->the_post(); ?>

<!-- Convert Date to Date Stamp -->
<?php $podcast_date = get_post_meta($post->ID, \'_date\', true);?>
<?php $fixed_date = strtotime($podcast_date); ?>

<!-- Content -->

echo \'<input id="podcastmeta_noncename" name="podcastmeta_noncename" type="hidden" value="\' .     wp_create_nonce( plugin_basename(__FILE__) ) . \'" />\';

wp_nonce_field( plugin_basename( __FILE__ ), \'podcastmeta_noncename\' );