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run code in 150+ php & hhvm versions
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<?php var_dump(array( '1' => 'string "1"', 's1' => 'string "s1"', ));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(10) "string "1"" ["s1"]=> string(11) "string "s1"" }