如何在 WordPress 中禁用图像附件页面

WordPress上传附件之后会自动生成附件页面，如何禁止附件页面呢？我们可以禁止附件页面，使附件页面重定向 (301) 以发布父级（如果有）， 如果不是，则重定向（302）到主页。

在WordPress主题文件functions.php中或者使用Code Snippets插件添加自定义代码：

function sar_attachment_redirect() {

	global $post;

	if ( is_attachment() && isset( $post->post_parent ) && is_numeric( $post->post_parent ) && ( 0 !== $post->post_parent ) ) {

		// Is the post in trash?
		$parent_post_in_trash = get_post_status( $post->post_parent ) === 'trash' ? true : false;

		// Prevent endless redirection loop in old WP releases and redirecting to trashed posts if an attachment page is visited when parent post is in trash.
		if ( $parent_post_in_trash ) {
			// Theme 404 template available?
			$theme_404_template = locate_template( '404.php' );
			if ( ! empty( $theme_404_template ) ) {
				global $wp_query;
				$wp_query->set_404();
				status_header( 404 );
				nocache_headers();
				require get_404_template();
				exit;
			} else {
				wp_die( 'Page not found.', '404 - Page not found', 404 );
				exit;
			}
		}

		// Redirect to post/page from where attachment was uploaded.
		wp_safe_redirect( get_permalink( $post->post_parent ), '301' );
		exit;

	} elseif ( is_attachment() && isset( $post->post_parent ) && is_numeric( $post->post_parent ) && ( $post->post_parent < 1 ) ) {

		// Redirect to home for attachments not associated to any post/page.
		wp_safe_redirect( get_bloginfo( 'wpurl' ), '302' );
		exit;

	}
}

add_action( 'template_redirect', 'sar_attachment_redirect', 1 );