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run code in 200+ php & hhvm versions
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<?php $array = [ "parent" => [ "title" => null ] ]; var_dump(iterator_to_array(new RecursiveIterator(new ArrayIterator($array)), true));
based on TMrkC
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Cannot instantiate interface RecursiveIterator in /in/NV93A:9 Stack trace: #0 {main} thrown in /in/NV93A on line 9
Process exited with code 255.
Output for 5.4.10 - 5.6.28
Fatal error: Cannot instantiate interface RecursiveIterator in /in/NV93A on line 9
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/NV93A on line 3
Process exited with code 255.