根据此评论：

我知道标题可以在标题中定义。php文件，但我不想触及现有的头。php，但在子主题的函数中执行。改为php

但是，在其wp_title 过滤器回调；相反，它是在呼吁wp_title(), 在里面header.php:

<title><?php wp_title( \'|\', true, \'right\' ); ?></title>

function twentytwelve_wp_title( $title, $sep ) {
    global $paged, $page;

    if ( is_feed() )
        return $title;

    // Add the site name.
    $title .= get_bloginfo( \'name\' );

    // Add the site description for the home/front page.
    $site_description = get_bloginfo( \'description\', \'display\' );
    if ( $site_description && ( is_home() || is_front_page() ) )
        $title = "$title $sep $site_description";

    // Add a page number if necessary.
    if ( $paged >= 2 || $page >= 2 )
        $title = "$title $sep " . sprintf( __( \'Page %s\', \'twentytwelve\' ), max( $paged, $page ) );

    return $title;
}
add_filter( \'wp_title\', \'twentytwelve_wp_title\', 10, 2 );

更换header.php 通过子主题，并调用：

<title><?php wp_title( \'-\', true, \'right\' ); ?></title>

function wpse87673_filter_wp_title( $title, $sep ) {
    // Your callback code goes here
}
add_filter( \'wp_title\', \'wpse87673_filter_wp_title\', 11, 2 );
remove_filter( \'wp_title\', \'twentytwelve_wp_title\', 10, 2 );

这似乎有效：

 <?php

function johndoe999_filter_wp_title( $title, $sep ) {
global $paged, $page;

$sep = \' - \';

$title = get_the_title();

if ( is_feed() ) {
return $title;
}

$title .= $sep;

$blogname = get_bloginfo(\'name\');

// Add the site name.
$title .= $blogname;

// Add the site description for the home/front page.
$site_description = get_bloginfo( \'description\', \'display\' );
if ( $site_description && ( is_home() || is_front_page() ) ) {
$title = "$blogname - $site_description";
}

// Add a page number if necessary.
if ( $paged >= 2 || $page >= 2 ) {
$title = "$title $sep " . sprintf( __( \'Page %s\', \'twentytwelve\' ), max( $paged, $page ) );
}

return $title;
}


add_filter( \'wp_title\', \'johndoe999_filter_wp_title\', 10, 2 );

function johndoe999_remove_title () {
remove_filter( \'wp_title\', \'twentytwelve_wp_title\', 10, 2 );
}

add_action( \'after_setup_theme\', \'johndoe999_remove_title\' );


?>