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run code in 200+ php & hhvm versions
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<?php var_dump(array('a' => 1, 'b', 'c', 'd' => 2));
based on CJLMv
Output for 4.3.0 - 7.2.0
array(4) { ["a"]=> int(1) [0]=> string(1) "b" [1]=> string(1) "c" ["d"]=> int(2) }