ms_upload_constants()

定义多站点上载常量。
Defines Multisite upload constants.

目录锚点：#说明#返回#源码

说明（Description）

存在，以便与通过wp includes/ms提供的旧文件向后兼容-文件.php（可湿性粉剂含量/博客.php以亩为单位）。

返回（Return）

无返回值

源码（Source）

/**
 * Defines Multisite upload constants.
 *
 * Exists for backward compatibility with legacy file-serving through
 * wp-includes/ms-files.php (wp-content/blogs.php in MU).
 *
 * @since 3.0.0
 *
 * @global wpdb $wpdb
 */
function ms_upload_constants() {
	global $wpdb;

	// 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' ) ) {
		define( 'UPLOADS', UPLOADBLOGSDIR . "/{$wpdb->blogid}/files/" );

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