json_encode an array of objects with private properties

Question

I'm looking for an efficient way to use json_encode for an array of objects. The issue I have is that my objects all have private properties (use getters and setters) and json_encode won't pull those in. So I created a jsonSerialize function for an object with returns the private variables but I don't know how to execute the function for each object in the array efficiently. I could use a loop to execute the jsonSerialize function for each object but that I'm afraid that may be too slow.

class car 
{
     private $make, $model;
     public function jsonSerialize()
     {
          return get_object_vars($this);
     }
}

Controller function to return list of cars in json format

$cars = $db->getAllCars();  //returns an array of objects using fetchall

return json_encode($cars);

stackoverflow.com/questions/7005860/…

Saeed M.
– Saeed M.

2016-01-10 20:24:05 +00:00
Commented Jan 10, 2016 at 20:24 — Saeed M.
– Saeed M., Commented Jan 10, 2016 at 20:24

Mathew B. · Accepted Answer · 2016-01-10 20:28:38Z

9

You can't use json_encode for objects, it's written in the manual (http://php.net/manual/en/function.json-encode.php)

First you need to implement in your object the JsonSerializable interface to achieve what you're looking for (http://php.net/manual/en/jsonserializable.jsonserialize.php).

In your case you're missing the interface declaration. Try this

class car  implements JsonSerializable
{
     private $make, $model;
     public function jsonSerialize()
     {
          return get_object_vars($this);
     }
}

answered Jan 10, 2016 at 20:28

Mathew B.

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clean_coding · Accepted Answer · 2016-01-10 20:32:02Z

3

You can use the JsonSerializable type like this:

class Car implements JsonSerializable
{
     private $make, $model;

     public function jsonSerialize() {
         return array($this->make, $this->model);
     }
} 

var $car = new Car();
echo json_encode($car, JSON_PRETTY_PRINT);

answered Jan 10, 2016 at 20:32

clean_coding

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