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run code in 200+ php & hhvm versions
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<?php $foo = [1,2,3,"r" => "fsdfsdf"]; var_dump(json_encode(json_encode($foo)));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
string(45) ""{\"0\":1,\"1\":2,\"2\":3,\"r\":\"fsdfsdf\"}""