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run code in 150+ php & hhvm versions
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<?php var_dump(array(031 => 031, "032" => "032", "033" => (int)"033"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [25]=> int(25) ["032"]=> string(3) "032" ["033"]=> int(33) }