$callbackReturn = call_user_func(
$externalCallback,
$parsedDTD['type'],
- isset( $parsedDTD['publicid'] ) ? $parsedDTD['publicid'] : null,
- isset( $parsedDTD['systemid'] ) ? $parsedDTD['systemid'] : null
+ $parsedDTD['publicid'] ?? null,
+ $parsedDTD['systemid'] ?? null
);
}
if ( $callbackReturn ) {