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<?php $arr1 = ["a","b","c"]; var_dump(json_encode($arr1)); $arr2 = [1=>"A", 4=>"b", 10=>"c"]; var_dump(json_encode($arr2)); $arr3 = [1=>"A", 14=>"b", 10=>"c"]; var_dump(json_encode($arr2));

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