我在为我的子主题放置自己的默认自定义标题图像时有问题，但如果不更改父主题（2017年），我就无法这样做。

我可以通过以下方式删除自定义标题：

remove_theme_support(\'custom-header\', 15);

但当我将它们添加回我的子主题时，子主题仍然显示2017个默认自定义标题图像

$custom_header_args = array(
        \'default-image\'      => get_theme_file_uri( \'/assets/images/header.jpg\' ),
        \'width\'              => 2000,
        \'height\'             => 1200,
        \'flex-height\'        => true,
        \'video\'              => true,
    );
    add_theme_support( \'custom-header\', $custom_header_args );

这可以通过对2017/inc/custom标题的细微修改得到最好的证明。php文件。

    add_theme_support( \'custom-header\', apply_filters( \'twentyseventeen_custom_header_args\', array(
        \'default-image\'      => get_parent_theme_file_uri( \'/assets/images/header.jpg\' ),
        \'width\'              => 2000,
        \'height\'             => 1200,
        \'flex-height\'        => true,
        \'video\'              => true,
        \'wp-head-callback\'   => \'twentyseventeen_header_style\',
    ) ) );
    remove_theme_support(\'custom-header\');
    add_theme_support( \'custom-header\', apply_filters( \'twentyseventeen_custom_header_args\', array(
        \'default-image\'      => get_theme_file_uri( \'/assets/images/header.jpg\' ),
        \'width\'              => 2000,
        \'height\'             => 1200,
        \'flex-height\'        => true,
        \'video\'              => true,
        \'wp-head-callback\'   => \'twentyseventeen_header_style\',
    ) ) );

如果我有这样的主题，父主题的标题。jpg显示为自定义标题。但是，如果注释掉第一个默认图像定义，则会看到子主题标题。jpg。

那么，为什么之前的值没有被覆盖呢？它们怎么会被覆盖呢？

$custom_header_args = array(
    \'default-image\' => get_theme_file_uri( \'/assets/images/header.jpg\' ),
    \'width\' => 2000,
    \'height\' => 1200,
    \'flex-height\' => true,
    \'video\' => true,
);
add_theme_support(\'custom-header\', $custom_header_args);

// Merge in data from previous add_theme_support() calls.
// The first value registered wins. (A child theme is set up first.)
if ( isset( $_wp_theme_features[\'custom-header\'] ) )
    $args[0] = wp_parse_args( $_wp_theme_features[\'custom-header\'][0], $args[0] );