您可以尝试以下操作：

/**
 * Modify the header title on single pages 
 * but exclude the \'post\', \'attachment\' and \'page\' post types. 
 * 
 * Header Title:  Site Name | Post Type Label | Post Title
 *
 * Example:       My Shopping Site | Products | Sony Playstation 4
 */
function wpse_141145_wp_title( $title, $sep ) {

    if( is_single() && \'post\' !== ( $pt = get_post_type() ) )
    {
        // Get the current post type object\'s \'singular name\' else \'name\':
        $pto        = get_post_type_object( $pt );
        $pto_lsn    = $pto->labels->singular_name;
        $pto_ln     = $pto->labels->name;
        $pto_title  = ( ! empty( $pto_lsn )  ) ) ? $pto_lsn : $pto_ln ;

        // Space around the separator:
        $sep = sprintf( \' %s \', trim( $sep ) );

        // Construct the breadcrumb:    
        $title  = get_bloginfo( \'name\', \'display\' );
        $title .= $sep;
        $title .= $pto_title;
        $title .= $sep;
        $title .= single_post_title( \'\', FALSE );
    }
    return esc_attr( $title );
}
add_filter( \'wp_title\', \'wpse_141145_wp_title\', 99, 2 );

你是指这种修改，还是你另有打算？