Title: WP_Object_Cache::switch_to_blog
Published: April 25, 2014
Last modified: April 28, 2025

---

# WP_Object_Cache::switch_to_blog( int $blog_id )

## In this article

 * [Description](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#description)
 * [Parameters](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#wp--skip-link--target)

Switches the internal blog ID.

## 󠀁[Description](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#description)󠁿

This changes the blog ID used to create keys in blog specific groups.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#parameters)󠁿

 `$blog_id`intrequired

Blog ID.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#source)󠁿

    ```php
    public function switch_to_blog( $blog_id ) {
    	$blog_id           = (int) $blog_id;
    	$this->blog_prefix = $this->multisite ? $blog_id . ':' : '';
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-object-cache.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-object-cache.php#L601)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-object-cache.php#L601-L604)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#related)󠁿

| Used by | Description | 
| [wp_cache_switch_to_blog()](https://developer.wordpress.org/reference/functions/wp_cache_switch_to_blog/)`wp-includes/cache.php` |

Switches the internal blog ID.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_object_cache/switch_to_blog/?output_format=md#changelog)󠁿

| Version | Description | 
| [3.5.0](https://developer.wordpress.org/reference/since/3.5.0/) | Introduced. |

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