我正在将标题图像设置为.blog__header 通过函数中的内联样式阻止。php：

$header_image = get_header_image();

if ( $header_image ) {
    $header_image_css = "
            .blog__header {
                    background-image: url({$header_image});
            }";
    wp_add_inline_style( \'theme-styles\', $header_image_css );
}

现在，如果设置了，我想用特征图像替换此标题图像：

$header_image = get_header_image();

if ( has_post_thumbnail() ) {
    $post_thumbnail = get_the_post_thumbnail(\'full\');
}

if ( $header_image ) {
    $header_image_css = "
            .blog__header {
                    background-image: url({$header_image});
            }";
    wp_add_inline_style( \'theme-styles\', $header_image_css );
} elseif ( has_post_thumbnail() ) {
    $post_thumbnail_css = "
            .blog__header {
                    background-image: url({$post_thumbnail});
            }";
    wp_add_inline_style( \'theme-styles\', $post_thumbnail_css );
}

然而，这不起作用，可能是因为我还没有设置帖子ID。任何帮助都将不胜感激！

global $post;
$header_image = \'\';

// featured image is first priority, right?
if ( has_post_thumbnail( $post->ID ) ) {
    $header_image = get_the_post_thumbnail_url( $post->ID, \'full\' );
} elseif ( !empty( get_header_image() ) ) {
    $header_image = get_header_image();
}

$header_image_css = ".blog__header { background-image: url({$header_image}); }";
wp_add_inline_style( \'theme-styles\', $header_image_css );