Title: update_home_siteurl
Published: April 25, 2014
Last modified: April 28, 2025

---

# update_home_siteurl( string $old_value, string $value )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#changelog)

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

Flushes rewrite rules if `siteurl`, `home` or `page_on_front` changed.

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

 `$old_value`stringrequired

`$value`stringrequired

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

    ```php
    function update_home_siteurl( $old_value, $value ) {
    	if ( wp_installing() ) {
    		return;
    	}

    	if ( is_multisite() && ms_is_switched() ) {
    		delete_option( 'rewrite_rules' );
    	} else {
    		flush_rewrite_rules();
    	}
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-admin/includes/misc.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-admin/includes/misc.php#L566)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/misc.php#L566-L576)

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

| Uses | Description | 
| [wp_installing()](https://developer.wordpress.org/reference/functions/wp_installing/)`wp-includes/load.php` |

Checks or sets whether WordPress is in “installation” mode.

  | 
| [delete_option()](https://developer.wordpress.org/reference/functions/delete_option/)`wp-includes/option.php` |

Removes an option by name. Prevents removal of protected WordPress options.

  | 
| [flush_rewrite_rules()](https://developer.wordpress.org/reference/functions/flush_rewrite_rules/)`wp-includes/rewrite.php` |

Removes rewrite rules and then recreate rewrite rules.

  | 
| [ms_is_switched()](https://developer.wordpress.org/reference/functions/ms_is_switched/)`wp-includes/ms-blogs.php` |

Determines if [switch_to_blog()](https://developer.wordpress.org/reference/functions/switch_to_blog/) is in effect.

  | 
| [is_multisite()](https://developer.wordpress.org/reference/functions/is_multisite/)`wp-includes/load.php` |

Determines whether Multisite is enabled.

  |

[Show 1 more](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#)
[Show less](https://developer.wordpress.org/reference/functions/update_home_siteurl/?output_format=md#)

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

| Version | Description | 
| [2.1.0](https://developer.wordpress.org/reference/since/2.1.0/) | Introduced. |

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Ffunctions%2Fupdate_home_siteurl%2F)
before being able to contribute a note or feedback.