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run code in 200+ php & hhvm versions
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<?php function test() { return ['a' => '1', 'b' => '2']; } var_dump(test());
based on GVnnJ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.11
array(2) { ["a"]=> string(1) "1" ["b"]=> string(1) "2" }