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update_home_siteurl( string $old_value, string $value )

Flushes rewrite rules if siteurl, home or page_on_front changed.

Parameters

$old_value

(string) (Required)

$value

(string) (Required)

Source

File: wp-admin/includes/misc.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();
	}
}

Uses

Uses Description
wp-includes/load.php: wp_installing()

Check or set whether WordPress is in “installation” mode.
wp-includes/load.php: is_multisite()

If Multisite is enabled.
wp-includes/option.php: delete_option()

Removes option by name. Prevents removal of protected WordPress options.
wp-includes/rewrite.php: flush_rewrite_rules()

Remove rewrite rules and then recreate rewrite rules.
wp-includes/ms-blogs.php: ms_is_switched()

Determines if switch_to_blog() is in effect

Changelog

Version Description
2.1.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/update_home_siteurl