php-advanced-json-rpc
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fix: Implicitly nullable parameter types are deprecated in PHP 8.4
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Implicitly nullable parameter types are deprecated in PHP 8.4
- https://wiki.php.net/rfc/deprecate-implicitly-nullable-types
?Type syntax was added in PHP 7.1, so there are no backward compatibility issues.
- https://wiki.php.net/rfc/nullable_types