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run code in 200+ php & hhvm versions
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<?php echo var_export(array(-1 => 'a'), true);
Output for 4.3.0 - 5.2.13, 5.3.0 - 5.3.2, 5.3.4 - 7.2.0
array ( -1 => 'a', )
Output for 5.2.14 - 5.2.17, 5.3.3
array ( 18446744073709551615 => 'a', )