wp-includes/option.php:1958Updates the value of an option that was already added for the current network.
$optionstring$valuemixedboolfunction update_site_option( $option, $value ) { return update_network_option( null, $option, $value );}Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/option.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.