调用switch_to_blog()后恢复当前博客

原型

restore_current_blog()

返回值

(bool)  如果我们已经在当前的博客上,那么就成功了

源文件

路径:wp-includes/ms-blogs.php

<?php
...
function restore_current_blog() {
	global $wpdb;
	if ( empty( $GLOBALS['_wp_switched_stack'] ) ) {
		return false;
	}
	$blog = array_pop( $GLOBALS['_wp_switched_stack'] );
	$blog_id = get_current_blog_id();
	if ( $blog_id == $blog ) {
		/** This filter is documented in wp-includes/ms-blogs.php */
		do_action( 'switch_blog', $blog, $blog );
		// If we still have items in the switched stack, consider ourselves still 'switched'
		$GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] );
		return true;
	}
	$wpdb->set_blog_id( $blog );
	$prev_blog_id = $blog_id;
	$GLOBALS['blog_id'] = $blog;
	$GLOBALS['table_prefix'] = $wpdb->get_blog_prefix();
	if ( function_exists( 'wp_cache_switch_to_blog' ) ) {
		wp_cache_switch_to_blog( $blog );
	} else {
		global $wp_object_cache;
		if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) ) {
			$global_groups = $wp_object_cache->global_groups;
		} else {
			$global_groups = false;
		}
		wp_cache_init();
		if ( function_exists( 'wp_cache_add_global_groups' ) ) {
			if ( is_array( $global_groups ) ) {
				wp_cache_add_global_groups( $global_groups );
			} else {
				wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites', 'site-details' ) );
			}
			wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) );
		}
	}
	/** This filter is documented in wp-includes/ms-blogs.php */
	do_action( 'switch_blog', $blog, $prev_blog_id );
	// If we still have items in the switched stack, consider ourselves still 'switched'
	$GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] );
	return true;
}
...
?>

其他

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