帖子的主语言应该保存在帖子元字段中。没有办法自动检测到这一点。甚至谷歌的启发式算法也经常失败。

因此，添加自定义字段lang 并检查…

$language = get_post_meta( get_the_ID(), \'lang\', TRUE );

更新这里是一个非常简单的语言选择器示例。它将在具有Publish 代谢箱。

get_post_meta( get_the_ID(), \'_language\', TRUE ); 

…将返回帖子的语言（如果可用）。

add_action( \'post_submitbox_misc_actions\', \'t5_language_selector\' );
add_action( \'save_post\', \'t5_save_language\' );

function t5_language_selector()
{
    print \'<div class="misc-pub-section">
        <label for="t5_language_id">Language</label>
        <select name="t5_language" id="t5_language_id">\';

    $current = get_post_meta( get_the_ID(), \'_language\', TRUE );
    $languages = array (
        \'en\' => \'English\',
        \'de\' => \'Deutsch\',
        \'ja\' => \'日本人\'
    );

    foreach ( $languages as $key => $language )
        printf(
            \'<option value="%1$s" %2$s>%3$s</option>\',
            $key,
            selected( $key, $current, FALSE ),
            $language
        );

    print \'</select></div>\';
}


function t5_save_language( $id )
{
    if ( defined( \'DOING_AJAX\' ) && DOING_AJAX )
        return;

    if ( ! current_user_can( \'edit_post\', $id ) )
        return;

    if ( ! isset ( $_POST[\'t5_language\'] ) )
        return delete_post_meta( $id, \'_language\' );

    if ( ! in_array( $_POST[\'t5_language\'], array ( \'en\', \'de\', \'ja\' ) ) )
        return;

    update_post_meta( $id, \'_language\', $_POST[\'t5_language\'] );
}