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run code in 200+ php & hhvm versions
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<?php var_dump(json_decode(json_encode(['one' => 1, 'two' => 2, 'four' => 4])));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.8
object(stdClass)#1 (3) { ["one"]=> int(1) ["two"]=> int(2) ["four"]=> int(4) }