(PHP 8 >= 8.1.0)
SplFixedArray::jsonSerialize — Returns a representation that can be converted to JSON
public SplFixedArray::jsonSerialize(): array
Serializes the array to a value that can be serialized natively by json_encode().
This function has no parameters.
Returns array data which can be serialized by json_encode(), which is a value of any type other than a resource.
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https://www.php.net/manual/en/splfixedarray.jsonserialize.php