您只需添加支票即可：

if ( ! empty ( $post->post_parent ) )
{
    $parent_title = get_the_title($post->post_parent);
    echo "<h1>$parent_title</h1>";
}

setup_postdata( $post->post_parent );
the_title( /* arguments here*/ );
wp_reset_postdata();

我只想过滤the_title:

function wpse140502_filter_page_title( $title ) {
    // only do something on static pages
    // and on the main query
    if ( is_page() && is_main_query() ) {
        // let\'s see if the current page has a parent
        global $post;
        if ( 0 != $post->post_parent ) {
            // Set this to whatever you want
            $delimiter = \': \';
            // Append post-parent title to title and return it
            return get_the_title( $post->post_parent ) . $delimiter . $title;
        }
    }
    // return title
    return $title;
}
add_filter( \'the_title\', \'wpse140502_filter_page_title\' );

您可以只输出标题周围的标题，而不使用$before 和$after 参数：

if ( get_the_title() ) {
    global $post;

    echo \'<header class="entry-header"><h1 class="entry-title">\';
    echo get_the_title() . \' - \' . get_the_title( $post->post_parent );
    echo \'</h1></header>\';
}

the_title( \'<header class="entry-header"><h1 class="entry-title">\' . get_the_title( $post->post_parent ), \'</h1></header><!-- .entry-header -->\' );

the_title( \'<header class="entry-header"><h1 class="entry-title">\', get_the_title( $post->post_parent ) . \'</h1></header><!-- .entry-header -->\' );