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<?php $array = [ "parent" => [ "title" => null ] ]; var_dump(iterator_to_array(new RecursiveIteratorIterator(new ArrayIterator($array)), true));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught InvalidArgumentException: An instance of RecursiveIterator or IteratorAggregate creating it is required in /in/TMrkC:9 Stack trace: #0 /in/TMrkC(9): RecursiveIteratorIterator->__construct(Object(ArrayIterator)) #1 {main} thrown in /in/TMrkC on line 9
Process exited with code 255.

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