Disallows special characters in BuddyPress username

disallow-special-characters-in-buddypress-user-name

/**
 * Disallow special characters in BuddyPres username.
 */
add_filter( 'bp_core_validate_user_signup', function ( $results ) {
	if ( empty( $results ) || empty( $results['errors'] ) ) {
		return $results;
	}

	$username = $results['user_name'];

	$invalid_characters = array(
		'@' => '',
		'.' => '',
		'-' => '',

	);

	$sanitized = str_replace( array_keys( $invalid_characters ), array_values( $invalid_characters ), $username );

	if ( $sanitized !== $username ) {
		$results['errors']->add( 'user_name', sprintf( 'Special characters %s are not allowed!', join( ',', array_keys( $invalid_characters ) ) ) );
	}

	return $results;
} );