[@bjornwebdesign Participant 10 years, 3 months ago]

Ok, last time, I promise :p…

I updated all my users with the above function, but I don’t want it to run every time on the init hook.
So I changed it into:

/*
 * Do stuff when the user's xprofile is updated
*/	
function xprofile_updated ( $user_id, $posted_field_ids, $errors, $old_values, $new_values) {
	/*
	 * Change the user_nicename which is used as profile url, we do NOT want the username in url! Bad bad BP...
	 * Please note: the user profile url can now be changed by the user, direct linking from other places on the web may result in 404.
	 * Altough this should run AFTER updating profile fields (saving to DB), the nicename is only updated after a second save. So we need to check from $new_values
	 */
	$new_display_name = '';
	foreach ( $new_values as $key => $value ) {
		if ( is_array($value) && $key == 1 ) { // field display_name = 1, make sure this is correct
			foreach ( $value as $k => $v ) {
				if ( $k == 'value' ) {
					$new_display_name = $v;
				}
			}
		}
	}
	//error_log('******** xprofile_updated: '.$user_id.' | NEW DISPLAY_NAME: '.$new_display_name.' *********');
	$search = array( ' ', '.' ); 
	$replace = array( '_', '' );
	$user = get_user_by( 'ID', $user_id );		
	if ( $user ) {
		if ( $user->data->user_status == 0 && $new_display_name ) {
			$new_user_nicename = strtolower(str_replace( $search, $replace, $new_display_name) );
			if ( strlen ( $new_user_nicename ) > 50 ) {
				$new_user_nicename = substr ( $new_user_nicename, 0, 50 );
			}				
			if ( $user->data->user_nicename != $new_user_nicename ) { // && $user->ID == 80 <-Add this if you only want to run it for 1 user, so you can test it.
				$args = array(
					'ID'            => $user->ID,
					'user_nicename' => $new_user_nicename
				);
				wp_update_user( $args );
				//error_log('******** updated user_nicename: '.$user->ID.' | NEW USER_NICENAME: '.$new_user_nicename.' *********');
				wp_redirect( get_site_url().'/leden/'.$new_user_nicename.'/profile/edit/group/1/' ); // we cant use bp_core_get_user_domain() here, because it still uses the old user_nicename
				exit;					
			}
		}
	}
}
add_action( 'xprofile_updated_profile',  'xprofile_updated', 100, 5 );

Please note, it has some site specific code, like the wp_redirect.
Any questions? Feel free to ask.

@mod: Hoping my code snippet is not too long.

Regards, Bjorn