Encoding static member of class as JSON in PHP - php

Question

I have the following piece of code.
class SomeClass
{
public static $one = 1;
private static $two = 2;
public $three = 3;
private $four = 4;
}
header("Content-Type: application/json");
echo json_encode(new SomeClass());
What I want to achieve is encode the public class property and member as a JSON object. My problem is that json_encode() ignores public static $one = 1; and the result will be:
{
"three": ​3
}
Although I expect it to print the public static member as well, such as:
{
"one": 1,
"three": ​3
}
Can JSON encoding be done with static members in PHP?

Answer 1

According to PHP manual:
Static properties cannot be accessed through the object using the arrow operator ->.
That means no
Nevertheless, I came up with the solution utilizing Reflections:
class SomeClass
{
public static $one = 1;
private static $two = 2;
public $three = 3;
private $four = 4;
}
$reflection = new ReflectionClass('SomeClass');
$instance = $reflection->newInstance();
$properties = $reflection->getProperties(ReflectionProperty::IS_PUBLIC);
$jsonArray = array();
foreach($properties as $property) {
$jsonArray[$property->getName()] = $property->getValue($instance);
}
echo json_encode($jsonArray);
The result is
{"one":1,"three":3}

Answer 2

In native implementation: NO.
In case you use Php v >= 5.4.0, you can use JsonSerializable
Here is example:
class myClass implements JsonSerializable
{
private $_name = 'test_name';
public $email = 'test#mail.com';
public static $staticVar = 5;
public function jsonSerialize()
{
return get_class_vars(get_class($this));
}
}
echo json_encode(new myClass());