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run code in 200+ php & hhvm versions
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<?php $array = []; $array["a"] = "b"; var_dump($array);
based on r3Gsi
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.3.0alpha1
array(1) { ["a"]=> string(1) "b" }