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run code in 200+ php & hhvm versions
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<?php $array = array( "foo" => "bar", "bar" => "foo", ); print_r($array);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.0
Array ( [foo] => bar [bar] => foo )