Add compatibility for PHP 8.1

[alexander-schranz]

Additonal parameter was added and fputcsv has a returntype of int|false now. For cross support php version support I added the #[ReturnTypeWillChange] attribute.

Example:

Errors:

php -r 'class CsvFileObject extends SplFileObject
{
public function fputcsv($fields, $delimiter = null, $enclosure = null, $escape = null, $eol = null){}
}'

PHP Deprecated: Return type of CsvFileObject::fputcsv($fields, $delimiter = null, $enclosure = null, $escape = null, $eol = null) should either be compatible with SplFileObject::fputcsv(array $fields, string $separator = ",", string $enclosure = """, string $escape = "\", string $eol = "\n"): int|false, or the #[ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in Command line code on line 3

Fix:

php -r 'class CsvFileObject extends SplFileObject
{
#[ReturnTypeWillChange]
public function fputcsv($fields, $delimiter = null, $enclosure = null, $escape = null, $eol = null){}
}'

[alexander-schranz]

Merged into fork: handcraftedinthealps#1