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<?php $array = array( "foo" => "bar", "bar" => "foo", 100 => -100, -100 => 100, ); var_dump($array); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { ["foo"]=> string(3) "bar" ["bar"]=> string(3) "foo" [100]=> int(-100) [-100]=> int(100) }