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backend - PHP:

echo json_encode($arr);

frontend - ajax:

success: function(data) {
  data = JSON.parse(data);
}

Object => Array:

Object.keys(obj).map(function (key) {
    return obj[key];
});

ES7特性(暂时别用)Object => Array: [Object.value()]https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Object/values)

Remember: Data transfer with strings(bin);