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run code in 150+ php & hhvm versions
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<?php var_dump($arr = array(3E100 => 'foo'), $arr[] = 'bar');
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(3) "foo" } string(3) "bar"
Output for 4.3.0 - 5.2.17
array(1) { [-9223372036854775808]=> string(3) "foo" } string(3) "bar"