ms_upload_constants

函数
ms_upload_constants ( No parameters )

ms_upload_constants: 这个函数定义了一些与WordPress Multisite使用的uploads目录有关的常数。这些常量包括UPLOADS常量,它定义了通往上传目录的路径;BLOGUPLOADDIR常量,它定义了相对于网站根目录的上传目录;以及UPLOADS_USE_YEARMONTH_FOLDERS常量,它定义了是否按年份和月份将上传组织到子目录。

定义了多站点上传常量。

存在是为了向后兼容通过wp-includes/ms-files.php(MU中的wp-content/blogs.php)进行的传统文件服务。

function ms_upload_constants() {
	// This filter is attached in ms-default-filters.php but that file is not included during SHORTINIT.
	add_filter( 'default_site_option_ms_files_rewriting', '__return_true' );

	if ( ! get_site_option( 'ms_files_rewriting' ) ) {
		return;
	}

	// Base uploads dir relative to ABSPATH.
	if ( ! defined( 'UPLOADBLOGSDIR' ) ) {
		define( 'UPLOADBLOGSDIR', 'wp-content/blogs.dir' );
	}

	// Note, the main site in a post-MU network uses wp-content/uploads.
	// This is handled in wp_upload_dir() by ignoring UPLOADS for this case.
	if ( ! defined( 'UPLOADS' ) ) {
		$site_id = get_current_blog_id();

		define( 'UPLOADS', UPLOADBLOGSDIR . '/' . $site_id . '/files/' );

		// Uploads dir relative to ABSPATH.
		if ( 'wp-content/blogs.dir' === UPLOADBLOGSDIR && ! defined( 'BLOGUPLOADDIR' ) ) {
			define( 'BLOGUPLOADDIR', WP_CONTENT_DIR . '/blogs.dir/' . $site_id . '/files/' );
		}
	}
}

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