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run code in 150+ php & hhvm versions
Bugs & Features
<?php function test($arr) { return iterator_to_array( new RecursiveIteratorIterator( new RecursiveArrayIterator($arr) ) ); } var_dump(test(array(1,2,3,4,array(5,6,array(7),8)))); var_dump(test(array(new stdClass, new stdClass)));
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(7) [1]=> int(6) [2]=> int(3) [3]=> int(8) } array(0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function iterator_to_array() in /in/ZTnrA on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: iterator_to_array() in /in/ZTnrA on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: iterator_to_array() in /in/ZTnrA on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: iterator_to_array() in /in/ZTnrA on line 4