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run code in 150+ php & hhvm versions
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<?php $a = array_fill(0, 4, NULL); $a[0]++; ++$a[1]; $a[2]--; --$a[3]; var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(1) [2]=> NULL [3]=> NULL }
Output for hhvm-3.10.0

Process exited with code 153.