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Serialization: allow null in instance_serialize. #48

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Serialization: allow null in instance_serialize. #48

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2 changes: 1 addition & 1 deletion kphp_polyfills.php
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Original file line number Diff line number Diff line change
Expand Up @@ -638,7 +638,7 @@ function _php_serialize_helper_run_or_warning(callable $fun) {
}
}

function instance_serialize(object $instance): ?string {
function instance_serialize(?object $instance): ?string {
KPHP\InstanceSerialization\ClassTransformer::$depth = 0;
return _php_serialize_helper_run_or_warning(static function() use ($instance) {
$packer = (new MessagePack\Packer(MessagePack\PackOptions::FORCE_STR))->extendWith(new KPHP\InstanceSerialization\ClassTransformer());
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