February 12, 2011 
Definition:
function update_user_option( $user_id, $option_name, $newvalue, $global = false ) {}
Update user option with global blog capability.
User options are just like user metadata except that they have support for global blog options. If the ‘global’ parameter is false, which it is by default it will prepend the WordPress table prefix to the option name.
Parameters
- int $user_id: User ID
- string $option_name: User option name.
- mixed $newvalue: User option value.
- bool $global: Optional. Whether option name is global or blog specific. Default false (blog specific).
Source code
function update_user_option( $user_id, $option_name, $newvalue, $global = false ) {
global $wpdb;
if ( !$global )
$option_name = $wpdb->prefix . $option_name;
// For backward compatibility. See differences between update_user_meta() and deprecated update_usermeta().
// http://core.trac.wordpress.org/ticket/13088
if ( is_null( $newvalue ) || is_scalar( $newvalue ) && empty( $newvalue ) )
return delete_user_meta( $user_id, $option_name );
return update_user_meta( $user_id, $option_name, $newvalue );
}
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A HitchHackers guide through WordPress 
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