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run code in 150+ php & hhvm versions
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<?php $bar = range(0, 5); $i = 0; $foo[$i] = $bar[$i++]; var_dump($foo);
Output for 5.1.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> int(0) }
Output for 4.3.0 - 5.0.5
array(1) { [0]=> int(0) }