定义多站点上载常量。

原型

ms_upload_constants()

描述

存在通过wp-includes / ms-files.php(MU中的wp-content / blogs.php)向后兼容遗留文件服务。

源文件

路径:wp-includes/ms-default-constants.php

<?php
...
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/' );
	}
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/ms_upload_constants/