February 11, 2011 
Definition:
function delete_blog_option( $id, $key ) {}
Delete an option for a particular blog.
Parameters
- int $id: The blog id
- string $key: The option key
Return values
returns:True on success, false on failure.
Source code
function delete_blog_option( $id, $key ) {
$id = (int) $id;
switch_to_blog($id);
$return = delete_option( $key );
restore_current_blog();
if ( $return )
wp_cache_set( $id . '-' . $key . '-blog_option', '', 'site-options' );
return $return;
}
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A HitchHackers guide through WordPress 
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