wp-includes/ms-blogs.php:455Updates an option for a particular blog.
$idint$optionstring$valuemixed$deprecatedmixedoptionalnullboolfunction update_blog_option( $id, $option, $value, $deprecated = null ) { $id = (int) $id; if ( null !== $deprecated ) { _deprecated_argument( __FUNCTION__, '3.1.0' ); } if ( get_current_blog_id() === $id ) { return update_option( $option, $value ); } switch_to_blog( $id ); $return = update_option( $option, $value ); restore_current_blog(); return $return;}Introduced in MU (3.0.0). Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-blogs.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.