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run code in 150+ php & hhvm versions
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<?php $arrays = array( array('one', 1 => 'two', 2 => 'three' ), array('four', 1 => 'five', 2 => 'six' ), array( 0 => 'seven', 1 => 'eight', 2 => 'nine' ), ); print_r(iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($arrays)), true));
based on naQlW
Output for 5.2.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => seven [1] => eight [2] => nine )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.0
Warning: iterator_to_array() expects exactly 1 parameter, 2 given in /in/8seag on line 10
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function iterator_to_array() in /in/8seag on line 10
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: iterator_to_array() in /in/8seag on line 10
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: iterator_to_array() in /in/8seag on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: iterator_to_array() in /in/8seag on line 10