Setting user's avatar programmatically?

Hi,
for set an image to the user avatar simply do this:
delete_metadata(‘post’, null, ‘_wp_attachment_wp_user_avatar’, $user_id, true);

update_user_meta($user_id, ‘_wp_attachment_wp_user_avatar’, $attach_id);

update_user_meta($user_id, $wpdb->get_blog_prefix($blog_id) . ‘user_avatar’, $attach_id);

For create an attachment:
$upload_dir = wp_upload_dir();

$wp_filetype = wp_check_filetype(basename($file), null);

$attachment = array(
‘guid’ => $upload_dir[‘url’] . ‘/’ . basename($file),
‘post_mime_type’ => $wp_filetype[‘type’],
‘post_title’ => preg_replace(‘/\.[^.]+$/’, ”, basename($file)),
‘post_content’ => ”,
‘post_status’ => ‘inherit’
);

$attach_id = wp_insert_attachment($attachment, $file);
$attach_data = wp_generate_attachment_metadata($attach_id, $file);

wp_update_attachment_metadata($attach_id, $attach_data);