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<?php $array = [ "parent" => [ "title" => null ] ]; var_dump(iterator_to_array(new RecursiveIteratorIterator(new ArrayIterator($array)), true));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
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.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Uncaught exception 'InvalidArgumentException' with message '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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